Materiały źródłowe

• #1 Ductal carcinoma in situ (DCIS) – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/dcis/symptoms-causes/syc-20371889

  Ductal carcinoma in situ is a very early form of breast cancer. In ductal carcinoma in situ, the cancer cells are confined inside a milk duct in the breast. The cancer cells haven’t spread into the breast tissue. […] It’s not clear what causes ductal carcinoma in situ, also called DCIS. This early form of breast cancer happens when cells inside a breast duct develop changes in their DNA. […] Healthcare professionals don’t know exactly what causes the changes in the cells that leads to DCIS. Factors that may play a part include lifestyle, environment and DNA changes that run in families.

• #2 Ductal Carcinoma in Situ (DCIS): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17869-ductal-carcinoma-in-situ-dcis

  Ductal carcinoma in situ (DCIS) happens when healthy cells in your milk duct mutate (change) and grow uncontrollably. But experts aren’t sure why these changes take place to begin with, or why DCIS spreads in some cases but not others. […] Certain factors can increase your risk of ductal carcinoma in situ, like: A biological family history of breast cancer. A personal history of breast cancer or atypical hyperplasia. Being female. Being over age 30. Getting your period before age 12. Having a baby after 30. Having dense breast tissue. Having gene mutations associated with increased cancer risk (BRCA 1 and BRCA 2). Having previous radiation therapy directed at your breasts or chest. Never being pregnant or breastfeeding. Starting menopause after age 55. […] Having a risk factor doesn’t mean you’ll get DCIS. For example, although a family history of breast cancer is a risk factor for DCIS, most people with ductal carcinoma in situ don’t have family members with breast cancer. Risk factors are all about probability what may increase your chance of developing a condition.

• #2 Ductal Carcinoma in Situ: Symptoms and Treatment

  https://www.verywellhealth.com/ductal-carcinoma-in-situ-dcis-430616

  DCIS is known to form as a result of genetic mutations in the DNA of breast duct cells. […] Researchers can’t say for sure what sets off the abnormal cell growth leading to DCIS. It is thought that a number of factors may play a part, including your genes, environment, and lifestyle.

• #3

  https://myhealth.alberta.ca/Health/aftercareinformation/pages/conditions.aspx?HwId=acg4920

  Ductal carcinoma in situ (DCIS) is the growth of abnormal cells in the milk ducts of the breast. It’s an early form of non-invasive breast cancer. Non-invasive means that the cells haven’t spread. Some cases of DCIS will become invasive breast cancer, but it’s impossible to know which ones. […] The exact cause of DCIS isn’t known. Age and family health history may play a part.

• #3 Ductal Carcinoma in Situ | Tampa General Hospital

  https://www.tgh.org/institutes-and-services/conditions/ductal-carcinoma-situ

  Ductal carcinoma in situ occurs when cells that line a milk duct undergo abnormal DNA changes that cause them to grow uncontrollably. […] However, the cancerous cells remain in place (in situ); they do not pass through the wall of the milk duct, invade nearby tissues or enter the lymphatic system or bloodstream.

• #4 Ductal Carcinoma In Situ of the Breast

  https://pmc.ncbi.nlm.nih.gov/articles/PMC4484537/

  Ductal carcinoma in situ (DCIS) of the breast is a potentially invasive neoplasm. Risk factors include high estrogen states such as use of oral contraceptive (OC) pills, nulliparity, advanced age at first birth, and also family history and genetic mutations. […] Increased exposure to estrogen, related to use of oral contraceptive (OC) pills, nulliparity, older age at first birth, or use of hormone replacement therapy (HRT) after menopause are associated with an increased risk for DCIS. […] Familial factors include family history of DCIS/invasive cancer. Mutations in the BRCA1 or BRCA2 genes have been implicated, which significantly increase the risk of developing DCIS/invasive disease. […] Various factors have been implicated in the development of the condition. Chromosomal imbalances including loss of heterozygosity occur in more than 70 % of high-grade carcinomas.

• #5 Ductal Carcinoma In Situ of the Breast

  https://pmc.ncbi.nlm.nih.gov/articles/PMC4484537/

  Molecular markers, such as expression of the estrogen receptor, overexpression of the human epidermal growth factor receptor 2 (HER2)/neu proto-oncogene and mutation in the p53 tumor suppressor gene have been identified. The expression of these markers is similar to that in invasive cancer. Hence, the factors causing DCIS are those implicated in invasive cancer as well.

• #6 Ductal carcinoma in situ (DCIS) | Cancer Research UK

  https://www.cancerresearchuk.org/about-cancer/breast-cancer/types/ductal-carcinoma-in-situ-dcis

  One clinical trial looked at the possible causes of DCIS. In particular, genetic changes that might increase the risk of developing it. The study team concluded that there may be some evidence that there is a genetic cause of DCIS and invasive breast cancer. But more research is needed. […] Doctors think that high grade DCIS is more likely to: […] spread into the surrounding breast tissue (become an invasive cancer).

• #7 DCIS breast cancer (Ductal carcinoma in situ) | Macmillan Cancer Support

  https://www.macmillan.org.uk/cancer-information-and-support/breast-cancer/ductal-carcinoma-in-situ-dcis

  DCIS is likely to be caused by a combination of different risk factors, rather than just 1 risk factor. […] The exact cause of DCIS is unknown. But certain things can increase the chance of developing it. These are called risk factors. The risk factors for DCIS and invasive breast cancer are similar. […] Having 1 or more risk factors does not mean you will definitely get DCIS. And if you do not have any risk factors, it does not mean you will not get DCIS.

• #8 Breast Ductal Carcinoma in Situ – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK567766/

  The evolution of normal breast tissue to DCIS is unknown. There is a genetic predisposition in some but not all patients with DCIS, most notably BRCA1 and BRCA2 mutations. […] Other risk factors contribute to the progression of DCIS to invasive breast cancer. As a woman ages from birth to death, the probability of developing invasive breast cancer is 12.3% or 1 in 8. Increased exposure to estrogen can also increase the risk of developing breast cancer. The use of hormone replacement therapy in postmenopausal women has been associated with an increased risk of breast cancer. Additionally, a high endogenous level of estrogen increases the risk of breast cancer; this can be approximated by age at first menarche, age at menopause, and age at first live birth. Alcohol use is associated with an increased risk of breast cancer as well. Patients with first-degree relatives with breast cancer are at a higher risk of breast cancer.

• #9 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Not all DCIS or other breast cancers are hereditary. However, a family history of breast cancer is a risk factor for developing DCIS and other types of breast cancer. Genetic mutations passed through the genes from parent to child, such as BRCA gene mutations, can also increase the chances of developing DCIS, though a genetic (hereditary) link is more commonly associated with invasive breast cancers than DCIS.

• #10 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Ductal carcinoma in situ (DCIS) is a common form of breast cancer, accounting for approximately 20-25% of all new breast cancer cases in the United States. DCIS is a non-invasive cancer where abnormal cells have been found in the lining of the breast milk ducts. […] Like other types of breast cancer, the exact cause of DCIS is unknown. However, there are risk factors that may increase the chance of developing DCIS as well as other types of breast cancer. Risk factors for breast cancer include genetic risk factors and environmental & lifestyle risk factors. […] Genetic risk factors for DCIS include: Gender: Women are nearly 100 times more likely to develop breast cancer than men. Age: The risk of developing DCIS increases with age. DCIS risk is highest in women between the ages of 65 and 69, though it can occur at any age. Family history: If a first-degree relative, such as a mother, sister, father, or child, was diagnosed with breast or ovarian cancer, there is a higher risk of developing breast cancer. The risk increases if the first-degree relative was diagnosed before the age of 50. Gene mutations: Those who test positive for a BRCA gene mutation or other type of breast cancer gene mutation have an increased risk of developing breast cancer.

• #11 Ductal Carcinoma In Situ of the Breast

  https://pmc.ncbi.nlm.nih.gov/articles/PMC4484537/

  Ductal carcinoma in situ (DCIS) of the breast is a potentially invasive neoplasm. Risk factors include high estrogen states such as use of oral contraceptive (OC) pills, nulliparity, advanced age at first birth, and also family history and genetic mutations. […] Increased exposure to estrogen, related to use of oral contraceptive (OC) pills, nulliparity, older age at first birth, or use of hormone replacement therapy (HRT) after menopause are associated with an increased risk for DCIS. […] Familial factors include family history of DCIS/invasive cancer. Mutations in the BRCA1 or BRCA2 genes have been implicated, which significantly increase the risk of developing DCIS/invasive disease. […] Various factors have been implicated in the development of the condition. Chromosomal imbalances including loss of heterozygosity occur in more than 70 % of high-grade carcinomas.

• #12 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Ductal carcinoma in situ (DCIS) is a common form of breast cancer, accounting for approximately 20-25% of all new breast cancer cases in the United States. DCIS is a non-invasive cancer where abnormal cells have been found in the lining of the breast milk ducts. […] Like other types of breast cancer, the exact cause of DCIS is unknown. However, there are risk factors that may increase the chance of developing DCIS as well as other types of breast cancer. Risk factors for breast cancer include genetic risk factors and environmental & lifestyle risk factors. […] Genetic risk factors for DCIS include: Gender: Women are nearly 100 times more likely to develop breast cancer than men. Age: The risk of developing DCIS increases with age. DCIS risk is highest in women between the ages of 65 and 69, though it can occur at any age. Family history: If a first-degree relative, such as a mother, sister, father, or child, was diagnosed with breast or ovarian cancer, there is a higher risk of developing breast cancer. The risk increases if the first-degree relative was diagnosed before the age of 50. Gene mutations: Those who test positive for a BRCA gene mutation or other type of breast cancer gene mutation have an increased risk of developing breast cancer.

• #13 Understanding Ductal Carcinoma In Situ (DCIS) | NBCFNational Breast Cancer Foundation logoNational Breast Cancer Foundation logo

  https://nbcf.org.au/about-breast-cancer/diagnosis/ductal-carcinoma-in-situ/

  Ductal carcinoma in situ (DCIS) is considered the earliest form of breast cancer. A diagnosis of DCIS means that abnormal cells have been found within the milk ducts of the breast. At this stage, the cells have not broken through the walls of the milk ducts into the surrounding breast tissue. […] Whilst a diagnosis of DCIS can happen to anyone, there are risk factors associated with all breast cancers that may increase the chance of developing DCIS. These are: Age – the risk increases as your age increases, Previous history of a non-cancerous breast disease, Family history of breast cancer, Increased breast density, Never having been pregnant, Having your first child after age 30, Having the first period early (before age 12), Beginning menopause after age 55, Certain genetic mutations such as BRCA1 and BRCA2. […] There are several known risk factors which may increase the likelihood of developing DCIS, one of which includes a family history of breast cancer.

• #14 Invasive Ductal Carcinoma (IDC) Breast Cancer | Breast Cancer Research Foundation

  https://www.bcrf.org/about-breast-cancer/invasive-ductal-carcinoma/

  Invasive ductal carcinoma is the most common type of breast cancer followed by invasive lobular carcinoma (ILC). […] The causes of invasive ductal carcinoma are not fully understood, but certain risk factors have been identified. These include: Smoking, Alcohol use, Being overweight, Prior radiation to the chest, Early start of menstrual periods, Late menopause, Never being pregnant, Having children later in life. […] Invasive ductal carcinoma has been linked to hereditary factors in five to 10 percent of cases. Mutations in BRCA1, BRCA2, and other genes such as PALB2, CHEK2, and ATM increase ones risk of developing breast cancer and can be passed on in families by both women and men.

• #15 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Not all DCIS or other breast cancers are hereditary. However, a family history of breast cancer is a risk factor for developing DCIS and other types of breast cancer. Genetic mutations passed through the genes from parent to child, such as BRCA gene mutations, can also increase the chances of developing DCIS, though a genetic (hereditary) link is more commonly associated with invasive breast cancers than DCIS.

• #16 Invasive Ductal Carcinoma (IDC) Breast Cancer | Breast Cancer Research Foundation

  https://www.bcrf.org/about-breast-cancer/invasive-ductal-carcinoma/

  Invasive ductal carcinoma is the most common type of breast cancer followed by invasive lobular carcinoma (ILC). […] The causes of invasive ductal carcinoma are not fully understood, but certain risk factors have been identified. These include: Smoking, Alcohol use, Being overweight, Prior radiation to the chest, Early start of menstrual periods, Late menopause, Never being pregnant, Having children later in life. […] Invasive ductal carcinoma has been linked to hereditary factors in five to 10 percent of cases. Mutations in BRCA1, BRCA2, and other genes such as PALB2, CHEK2, and ATM increase ones risk of developing breast cancer and can be passed on in families by both women and men.

• #17 Ductal Carcinoma In Situ of the Breast

  https://pmc.ncbi.nlm.nih.gov/articles/PMC4484537/

  Ductal carcinoma in situ (DCIS) of the breast is a potentially invasive neoplasm. Risk factors include high estrogen states such as use of oral contraceptive (OC) pills, nulliparity, advanced age at first birth, and also family history and genetic mutations. […] Increased exposure to estrogen, related to use of oral contraceptive (OC) pills, nulliparity, older age at first birth, or use of hormone replacement therapy (HRT) after menopause are associated with an increased risk for DCIS. […] Familial factors include family history of DCIS/invasive cancer. Mutations in the BRCA1 or BRCA2 genes have been implicated, which significantly increase the risk of developing DCIS/invasive disease. […] Various factors have been implicated in the development of the condition. Chromosomal imbalances including loss of heterozygosity occur in more than 70 % of high-grade carcinomas.

• #18 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #19 Ductal Carcinoma in Situ (DCIS)

  https://www.cancercenter.com/cancer-types/breast-cancer/types/common-breast-cancer-types/ductal-carcinoma-in-situ

  Ductal carcinoma in situ, or DCIS, occurs when cancer cells form in the milk duct cells in the breast. […] The exact cause of DCIS isn’t known, but some factors that may increase the risk of developing the disease. […] Not necessarily, but a family history of DCIS may increase a person’s risk. […] Other DCIS risk factors include: Giving birth to a first child after age 30, Never giving birth to a child, Using oral contraceptive medication that contains estrogen, Aging.

• #20 Ductal Carcinoma In Situ of the Breast

  https://pmc.ncbi.nlm.nih.gov/articles/PMC4484537/

  Ductal carcinoma in situ (DCIS) of the breast is a potentially invasive neoplasm. Risk factors include high estrogen states such as use of oral contraceptive (OC) pills, nulliparity, advanced age at first birth, and also family history and genetic mutations. […] Increased exposure to estrogen, related to use of oral contraceptive (OC) pills, nulliparity, older age at first birth, or use of hormone replacement therapy (HRT) after menopause are associated with an increased risk for DCIS. […] Familial factors include family history of DCIS/invasive cancer. Mutations in the BRCA1 or BRCA2 genes have been implicated, which significantly increase the risk of developing DCIS/invasive disease. […] Various factors have been implicated in the development of the condition. Chromosomal imbalances including loss of heterozygosity occur in more than 70 % of high-grade carcinomas.

• #21 Ductal Carcinoma in Situ (DCIS)

  https://www.cancercenter.com/cancer-types/breast-cancer/types/common-breast-cancer-types/ductal-carcinoma-in-situ

  Ductal carcinoma in situ, or DCIS, occurs when cancer cells form in the milk duct cells in the breast. […] The exact cause of DCIS isn’t known, but some factors that may increase the risk of developing the disease. […] Not necessarily, but a family history of DCIS may increase a person’s risk. […] Other DCIS risk factors include: Giving birth to a first child after age 30, Never giving birth to a child, Using oral contraceptive medication that contains estrogen, Aging.

• #22 Understanding Ductal Carcinoma In Situ (DCIS) | NBCFNational Breast Cancer Foundation logoNational Breast Cancer Foundation logo

  https://nbcf.org.au/about-breast-cancer/diagnosis/ductal-carcinoma-in-situ/

  Ductal carcinoma in situ (DCIS) is considered the earliest form of breast cancer. A diagnosis of DCIS means that abnormal cells have been found within the milk ducts of the breast. At this stage, the cells have not broken through the walls of the milk ducts into the surrounding breast tissue. […] Whilst a diagnosis of DCIS can happen to anyone, there are risk factors associated with all breast cancers that may increase the chance of developing DCIS. These are: Age – the risk increases as your age increases, Previous history of a non-cancerous breast disease, Family history of breast cancer, Increased breast density, Never having been pregnant, Having your first child after age 30, Having the first period early (before age 12), Beginning menopause after age 55, Certain genetic mutations such as BRCA1 and BRCA2. […] There are several known risk factors which may increase the likelihood of developing DCIS, one of which includes a family history of breast cancer.

• #23 Ductal Carcinoma in Situ (DCIS): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17869-ductal-carcinoma-in-situ-dcis

  Ductal carcinoma in situ (DCIS) happens when healthy cells in your milk duct mutate (change) and grow uncontrollably. But experts aren’t sure why these changes take place to begin with, or why DCIS spreads in some cases but not others. […] Certain factors can increase your risk of ductal carcinoma in situ, like: A biological family history of breast cancer. A personal history of breast cancer or atypical hyperplasia. Being female. Being over age 30. Getting your period before age 12. Having a baby after 30. Having dense breast tissue. Having gene mutations associated with increased cancer risk (BRCA 1 and BRCA 2). Having previous radiation therapy directed at your breasts or chest. Never being pregnant or breastfeeding. Starting menopause after age 55. […] Having a risk factor doesn’t mean you’ll get DCIS. For example, although a family history of breast cancer is a risk factor for DCIS, most people with ductal carcinoma in situ don’t have family members with breast cancer. Risk factors are all about probability what may increase your chance of developing a condition.

• #24 Understanding Ductal Carcinoma In Situ (DCIS) | NBCFNational Breast Cancer Foundation logoNational Breast Cancer Foundation logo

  https://nbcf.org.au/about-breast-cancer/diagnosis/ductal-carcinoma-in-situ/

  Ductal carcinoma in situ (DCIS) is considered the earliest form of breast cancer. A diagnosis of DCIS means that abnormal cells have been found within the milk ducts of the breast. At this stage, the cells have not broken through the walls of the milk ducts into the surrounding breast tissue. […] Whilst a diagnosis of DCIS can happen to anyone, there are risk factors associated with all breast cancers that may increase the chance of developing DCIS. These are: Age – the risk increases as your age increases, Previous history of a non-cancerous breast disease, Family history of breast cancer, Increased breast density, Never having been pregnant, Having your first child after age 30, Having the first period early (before age 12), Beginning menopause after age 55, Certain genetic mutations such as BRCA1 and BRCA2. […] There are several known risk factors which may increase the likelihood of developing DCIS, one of which includes a family history of breast cancer.

• #25 Ductal Carcinoma in Situ (DCIS): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17869-ductal-carcinoma-in-situ-dcis

  Ductal carcinoma in situ (DCIS) happens when healthy cells in your milk duct mutate (change) and grow uncontrollably. But experts aren’t sure why these changes take place to begin with, or why DCIS spreads in some cases but not others. […] Certain factors can increase your risk of ductal carcinoma in situ, like: A biological family history of breast cancer. A personal history of breast cancer or atypical hyperplasia. Being female. Being over age 30. Getting your period before age 12. Having a baby after 30. Having dense breast tissue. Having gene mutations associated with increased cancer risk (BRCA 1 and BRCA 2). Having previous radiation therapy directed at your breasts or chest. Never being pregnant or breastfeeding. Starting menopause after age 55. […] Having a risk factor doesn’t mean you’ll get DCIS. For example, although a family history of breast cancer is a risk factor for DCIS, most people with ductal carcinoma in situ don’t have family members with breast cancer. Risk factors are all about probability what may increase your chance of developing a condition.

• #26 Understanding Ductal Carcinoma In Situ (DCIS) | NBCFNational Breast Cancer Foundation logoNational Breast Cancer Foundation logo

  https://nbcf.org.au/about-breast-cancer/diagnosis/ductal-carcinoma-in-situ/

  Ductal carcinoma in situ (DCIS) is considered the earliest form of breast cancer. A diagnosis of DCIS means that abnormal cells have been found within the milk ducts of the breast. At this stage, the cells have not broken through the walls of the milk ducts into the surrounding breast tissue. […] Whilst a diagnosis of DCIS can happen to anyone, there are risk factors associated with all breast cancers that may increase the chance of developing DCIS. These are: Age – the risk increases as your age increases, Previous history of a non-cancerous breast disease, Family history of breast cancer, Increased breast density, Never having been pregnant, Having your first child after age 30, Having the first period early (before age 12), Beginning menopause after age 55, Certain genetic mutations such as BRCA1 and BRCA2. […] There are several known risk factors which may increase the likelihood of developing DCIS, one of which includes a family history of breast cancer.

• #27 Ductal carcinoma in situ – Wikipedia

  https://en.wikipedia.org/wiki/Ductal_carcinoma_in_situ

  Ductal carcinoma in situ (DCIS) is a pre-cancerous or non-invasive cancerous lesion of the breast. […] The specific causes of DCIS are still unknown. The risk factors for developing this condition are similar to those for invasive breast cancer. […] Some women are however more prone than others to developing DCIS. Women considered at higher risks are those who have a family history of breast cancer, those who have had their periods at an early age or who have had a late menopause. […] Long-term use of estrogen-progestin hormone replacement therapy (HRT) for more than five years after menopause, genetic mutations (BRCA1 or BRCA2 genes), atypical hyperplasia, as well as radiation exposure or exposure to certain chemicals may also contribute in the development of the condition. […] Nonetheless, the risk of developing noninvasive cancer increases with age and it is higher in women older than 45 years.

• #28 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #29 DCIS Breast Cancer: Symptoms, Treatment, Outlook

  https://www.healthline.com/health/breast-cancer/dcis-breast-cancer

  Hormone therapies: A 2019 meta-analysis showed that you may have a higher breast cancer risk if you take combined estrogen and progesterone hormone replacement therapy (HRT) or use certain hormonal contraception, but more research is necessary. […] Alcohol use: Alcohol intake has been associated with an increased risk of developing breast cancer. […] Weight: Obesity is associated with an increased risk of breast cancer, and it may also reduce the effectiveness of some breast cancer treatments, according to a 2019 research review. […] Pregnancy and breastfeeding: A 2023 meta-analysis suggests that you may have a higher risk of developing breast cancer if your first pregnancy is at a later age. Ever breastfeeding or a longer duration of it was associated with a decreased risk of breast cancer.

• #30 Breast Ductal Carcinoma in Situ – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK567766/

  The evolution of normal breast tissue to DCIS is unknown. There is a genetic predisposition in some but not all patients with DCIS, most notably BRCA1 and BRCA2 mutations. […] Other risk factors contribute to the progression of DCIS to invasive breast cancer. As a woman ages from birth to death, the probability of developing invasive breast cancer is 12.3% or 1 in 8. Increased exposure to estrogen can also increase the risk of developing breast cancer. The use of hormone replacement therapy in postmenopausal women has been associated with an increased risk of breast cancer. Additionally, a high endogenous level of estrogen increases the risk of breast cancer; this can be approximated by age at first menarche, age at menopause, and age at first live birth. Alcohol use is associated with an increased risk of breast cancer as well. Patients with first-degree relatives with breast cancer are at a higher risk of breast cancer.

• #31

  https://www.advocatehealth.com/health-services/cancer-institute/cancers-we-treat/breast-cancer/ductal-carcinoma-in-situ

  Ductal carcinoma in situ (DCIS) is a non-invasive cancer that grows inside the milk ducts of the breast. […] Several factors, such as age, family history and hormonal factors may increase the risk of developing DCIS. […] Women over the age of 50 are more likely to develop DCIS, although it can occur at any age. […] If you have previously been diagnosed with breast cancer in one breast, you may have an increased risk of developing DCIS in the other breast. […] If you’ve had radiation therapy to the chest, particularly during childhood or adolescence, it increases your risk of developing DCIS later in life. […] Factors that affect hormone levels, such as early menstruation, late menopause, never giving birth or having a first child after the age of 30, and using hormone replacement therapy for an extended period, may increase the risk of DCIS. […] Women with dense breast tissue, as seen on mammograms, have a higher risk of developing both DCIS and invasive breast cancer. […] Factors such as obesity, excessive alcohol consumption and a inactive lifestyle may also contribute to an increased risk of DCIS.

• #32 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #33 Ductal carcinoma in situ (DCIS) – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/dcis/symptoms-causes/syc-20371889

  Ductal carcinoma in situ is a very early form of breast cancer. In ductal carcinoma in situ, the cancer cells are confined inside a milk duct in the breast. The cancer cells haven’t spread into the breast tissue. […] It’s not clear what causes ductal carcinoma in situ, also called DCIS. This early form of breast cancer happens when cells inside a breast duct develop changes in their DNA. […] Healthcare professionals don’t know exactly what causes the changes in the cells that leads to DCIS. Factors that may play a part include lifestyle, environment and DNA changes that run in families.

• #34 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #35 Invasive Ductal Carcinoma (IDC): Overview, Treatment & Prognosis

  https://www.nationalbreastcancer.org/invasive-ductal-carcinoma/

  Ductal carcinoma in situ (DCIS) is non-invasive breast cancer; it forms and remains contained within the milk duct and has not yet spread to any other area of the breast or elsewhere in the body. […] The exact cause of invasive ductal carcinoma is not known or fully understood. While the underlying cause of IDC remains unknown, it results in a breast milk duct undergoing a genetic change (mutation) that causes the mutated cells to grow and divide rapidly. […] Though the cause is unknown, there are certain risk factors for IDC that researchers have identified. Risk factors for IDC can be both genetic and lifestyle & environmental. […] Genetic risk factors for invasive ductal carcinoma may include: Gender: Though men can develop IDC, it is nearly 100 times more common in women than in men. […] Lifestyle & environmental risk factors for invasive ductal carcinoma may include: Lack of physical activity, Poor diet, Being overweight or obese, Drinking alcohol or smoking, Long-term use (6 months or more) of hormonal replacement therapy (HRT).

• #36 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #37

  https://www.advocatehealth.com/health-services/cancer-institute/cancers-we-treat/breast-cancer/ductal-carcinoma-in-situ

  Ductal carcinoma in situ (DCIS) is a non-invasive cancer that grows inside the milk ducts of the breast. […] Several factors, such as age, family history and hormonal factors may increase the risk of developing DCIS. […] Women over the age of 50 are more likely to develop DCIS, although it can occur at any age. […] If you have previously been diagnosed with breast cancer in one breast, you may have an increased risk of developing DCIS in the other breast. […] If you’ve had radiation therapy to the chest, particularly during childhood or adolescence, it increases your risk of developing DCIS later in life. […] Factors that affect hormone levels, such as early menstruation, late menopause, never giving birth or having a first child after the age of 30, and using hormone replacement therapy for an extended period, may increase the risk of DCIS. […] Women with dense breast tissue, as seen on mammograms, have a higher risk of developing both DCIS and invasive breast cancer. […] Factors such as obesity, excessive alcohol consumption and a inactive lifestyle may also contribute to an increased risk of DCIS.

• #38 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #39 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #40 Breast Ductal Carcinoma in Situ – StatPearls – NCBI Bookshelf

  https://www.ncbi.nlm.nih.gov/books/NBK567766/

  The evolution of normal breast tissue to DCIS is unknown. There is a genetic predisposition in some but not all patients with DCIS, most notably BRCA1 and BRCA2 mutations. […] Other risk factors contribute to the progression of DCIS to invasive breast cancer. As a woman ages from birth to death, the probability of developing invasive breast cancer is 12.3% or 1 in 8. Increased exposure to estrogen can also increase the risk of developing breast cancer. The use of hormone replacement therapy in postmenopausal women has been associated with an increased risk of breast cancer. Additionally, a high endogenous level of estrogen increases the risk of breast cancer; this can be approximated by age at first menarche, age at menopause, and age at first live birth. Alcohol use is associated with an increased risk of breast cancer as well. Patients with first-degree relatives with breast cancer are at a higher risk of breast cancer.

• #41 DCIS Breast Cancer: Symptoms, Treatment, Outlook

  https://www.healthline.com/health/breast-cancer/dcis-breast-cancer

  Hormone therapies: A 2019 meta-analysis showed that you may have a higher breast cancer risk if you take combined estrogen and progesterone hormone replacement therapy (HRT) or use certain hormonal contraception, but more research is necessary. […] Alcohol use: Alcohol intake has been associated with an increased risk of developing breast cancer. […] Weight: Obesity is associated with an increased risk of breast cancer, and it may also reduce the effectiveness of some breast cancer treatments, according to a 2019 research review. […] Pregnancy and breastfeeding: A 2023 meta-analysis suggests that you may have a higher risk of developing breast cancer if your first pregnancy is at a later age. Ever breastfeeding or a longer duration of it was associated with a decreased risk of breast cancer.

• #42 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #43 Ductal carcinoma in situ (DCIS): Specialists for breast cancer precursors

  https://www.leading-medicine-guide.com/en/illness/genitourinary/ductal-carcinoma-in-situ

  The causes and risks of DCIS have not yet been clearly defined. From a scientific point of view, this is a new clinical picture. […] However, the factors favoring DCIS are likely to be largely similar to the causes and risk factors for breast cancer, for example: Heredity, Hormone fluctuations, Hormone therapies, obesity, Type II diabetes, Lack of exercise, Nicotine consumption, Alcohol consumption. […] Childless women have a statistically higher risk than mothers, non-breastfeeding mothers have a statistically higher risk than breastfeeding mothers. […] Age at the onset of the first menstruation and the menopause also determine the risk of breast cancer and the risk of DCIS: the longer the period between the onset of menstruation and the onset of the menopause, the more favorable the risk of the disease. […] There is no scientific evidence that tight bras, deodorants with aluminum, abortions or breast implants are responsible for breast cancer and DCIS.

• #44 Invasive Ductal Carcinoma (IDC): Overview, Treatment & Prognosis

  https://www.nationalbreastcancer.org/invasive-ductal-carcinoma/

  Ductal carcinoma in situ (DCIS) is non-invasive breast cancer; it forms and remains contained within the milk duct and has not yet spread to any other area of the breast or elsewhere in the body. […] The exact cause of invasive ductal carcinoma is not known or fully understood. While the underlying cause of IDC remains unknown, it results in a breast milk duct undergoing a genetic change (mutation) that causes the mutated cells to grow and divide rapidly. […] Though the cause is unknown, there are certain risk factors for IDC that researchers have identified. Risk factors for IDC can be both genetic and lifestyle & environmental. […] Genetic risk factors for invasive ductal carcinoma may include: Gender: Though men can develop IDC, it is nearly 100 times more common in women than in men. […] Lifestyle & environmental risk factors for invasive ductal carcinoma may include: Lack of physical activity, Poor diet, Being overweight or obese, Drinking alcohol or smoking, Long-term use (6 months or more) of hormonal replacement therapy (HRT).

• #45 Ductal Carcinoma in Situ (DCIS): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17869-ductal-carcinoma-in-situ-dcis

  Ductal carcinoma in situ (DCIS) happens when healthy cells in your milk duct mutate (change) and grow uncontrollably. But experts aren’t sure why these changes take place to begin with, or why DCIS spreads in some cases but not others. […] Certain factors can increase your risk of ductal carcinoma in situ, like: A biological family history of breast cancer. A personal history of breast cancer or atypical hyperplasia. Being female. Being over age 30. Getting your period before age 12. Having a baby after 30. Having dense breast tissue. Having gene mutations associated with increased cancer risk (BRCA 1 and BRCA 2). Having previous radiation therapy directed at your breasts or chest. Never being pregnant or breastfeeding. Starting menopause after age 55. […] Having a risk factor doesn’t mean you’ll get DCIS. For example, although a family history of breast cancer is a risk factor for DCIS, most people with ductal carcinoma in situ don’t have family members with breast cancer. Risk factors are all about probability what may increase your chance of developing a condition.

• #46 Understanding Ductal Carcinoma In Situ (DCIS) | NBCFNational Breast Cancer Foundation logoNational Breast Cancer Foundation logo

  https://nbcf.org.au/about-breast-cancer/diagnosis/ductal-carcinoma-in-situ/

  Ductal carcinoma in situ (DCIS) is considered the earliest form of breast cancer. A diagnosis of DCIS means that abnormal cells have been found within the milk ducts of the breast. At this stage, the cells have not broken through the walls of the milk ducts into the surrounding breast tissue. […] Whilst a diagnosis of DCIS can happen to anyone, there are risk factors associated with all breast cancers that may increase the chance of developing DCIS. These are: Age – the risk increases as your age increases, Previous history of a non-cancerous breast disease, Family history of breast cancer, Increased breast density, Never having been pregnant, Having your first child after age 30, Having the first period early (before age 12), Beginning menopause after age 55, Certain genetic mutations such as BRCA1 and BRCA2. […] There are several known risk factors which may increase the likelihood of developing DCIS, one of which includes a family history of breast cancer.

• #47 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Ductal carcinoma in situ (DCIS) is a common form of breast cancer, accounting for approximately 20-25% of all new breast cancer cases in the United States. DCIS is a non-invasive cancer where abnormal cells have been found in the lining of the breast milk ducts. […] Like other types of breast cancer, the exact cause of DCIS is unknown. However, there are risk factors that may increase the chance of developing DCIS as well as other types of breast cancer. Risk factors for breast cancer include genetic risk factors and environmental & lifestyle risk factors. […] Genetic risk factors for DCIS include: Gender: Women are nearly 100 times more likely to develop breast cancer than men. Age: The risk of developing DCIS increases with age. DCIS risk is highest in women between the ages of 65 and 69, though it can occur at any age. Family history: If a first-degree relative, such as a mother, sister, father, or child, was diagnosed with breast or ovarian cancer, there is a higher risk of developing breast cancer. The risk increases if the first-degree relative was diagnosed before the age of 50. Gene mutations: Those who test positive for a BRCA gene mutation or other type of breast cancer gene mutation have an increased risk of developing breast cancer.

• #48 Ductal Carcinoma in Situ (DCIS): What to Know About | Banner

  https://www.bannerhealth.com/services/cancer/cancer-type/breast-cancer/symptoms-and-types/dcis

  Ductal carcinoma in situ (DCIS) happens when cells in your milk ducts grow out of control, but experts dont know why this happens. […] These factors may raise your risk: Being over the age of 50, a family or personal history of breast cancer, having genetic mutations, such as BRCA1 or BRCA2, starting your period before age 12, having a baby after age 30 or never being pregnant or breastfeeding, having a previous breast cancer diagnosis, taking hormone replacement therapy for menopause symptoms, having dense breast tissue, having previous radiation therapy directed at your breasts or chest before age 30, drinking alcohol, obesity.

• #49 Case: Ductal Carcinoma In Situ – Radiology | UCLA Health

  https://www.uclahealth.org/departments/radiology/education/breast-imaging-teaching-resources/cases/case-ductal-carcinoma-situ

  Ductal carcinoma in situ (DCIS) is considered a noninvasive, precursor lesion to invasive breast cancer. The basic pathologic definition of DCIS is the presence of malignant epithelial cells within the mammary ducts and without invasion into or passed the basement membrane. […] There are several risk factors associated with DCIS. The most significant of these is age, with the vast majority of diagnoses occurring at age 50 years and peak incidence in the 65-69 age range. DCIS diagnosis is uncommon in the 30 age group. Other known risk factors include family history of breast cancer and nulliparity. There is either mixed data or lack of data establishing a relationship between DCIS diagnosis and hormone replacement therapy (HRT), contraceptive use, and smoking status. […] Due to the commonly mixed presentation of architectural subtypes of DCIS, newer systems of classification place an emphasis on nuclear grade. In general, DCIS is defined as monomorphic cells within the ductal lumen involving the TDLU that grow towards the nipple. The morphology of the nucleus within these cells defines their nuclear grade. Low-grade DCIS presents with small, regularly spaced cells containing round bland nuclei, no prominent nucleoli, and well-defined cell boundaries. High-grade DCIS contains large pleomorphic cells, poorly defined boundaries, and multiple nucleoli with regions of central necrosis. Intermediate-grade disease falls in between these two categories.

• #50 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Ductal carcinoma in situ (DCIS) is a common form of breast cancer, accounting for approximately 20-25% of all new breast cancer cases in the United States. DCIS is a non-invasive cancer where abnormal cells have been found in the lining of the breast milk ducts. […] Like other types of breast cancer, the exact cause of DCIS is unknown. However, there are risk factors that may increase the chance of developing DCIS as well as other types of breast cancer. Risk factors for breast cancer include genetic risk factors and environmental & lifestyle risk factors. […] Genetic risk factors for DCIS include: Gender: Women are nearly 100 times more likely to develop breast cancer than men. Age: The risk of developing DCIS increases with age. DCIS risk is highest in women between the ages of 65 and 69, though it can occur at any age. Family history: If a first-degree relative, such as a mother, sister, father, or child, was diagnosed with breast or ovarian cancer, there is a higher risk of developing breast cancer. The risk increases if the first-degree relative was diagnosed before the age of 50. Gene mutations: Those who test positive for a BRCA gene mutation or other type of breast cancer gene mutation have an increased risk of developing breast cancer.

• #51 Invasive Ductal Carcinoma (IDC): Overview, Treatment & Prognosis

  https://www.nationalbreastcancer.org/invasive-ductal-carcinoma/

  Ductal carcinoma in situ (DCIS) is non-invasive breast cancer; it forms and remains contained within the milk duct and has not yet spread to any other area of the breast or elsewhere in the body. […] The exact cause of invasive ductal carcinoma is not known or fully understood. While the underlying cause of IDC remains unknown, it results in a breast milk duct undergoing a genetic change (mutation) that causes the mutated cells to grow and divide rapidly. […] Though the cause is unknown, there are certain risk factors for IDC that researchers have identified. Risk factors for IDC can be both genetic and lifestyle & environmental. […] Genetic risk factors for invasive ductal carcinoma may include: Gender: Though men can develop IDC, it is nearly 100 times more common in women than in men. […] Lifestyle & environmental risk factors for invasive ductal carcinoma may include: Lack of physical activity, Poor diet, Being overweight or obese, Drinking alcohol or smoking, Long-term use (6 months or more) of hormonal replacement therapy (HRT).

• #52 Ductal Carcinoma in Situ (DCIS): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17869-ductal-carcinoma-in-situ-dcis

  Ductal carcinoma in situ (DCIS) happens when healthy cells in your milk duct mutate (change) and grow uncontrollably. But experts aren’t sure why these changes take place to begin with, or why DCIS spreads in some cases but not others. […] Certain factors can increase your risk of ductal carcinoma in situ, like: A biological family history of breast cancer. A personal history of breast cancer or atypical hyperplasia. Being female. Being over age 30. Getting your period before age 12. Having a baby after 30. Having dense breast tissue. Having gene mutations associated with increased cancer risk (BRCA 1 and BRCA 2). Having previous radiation therapy directed at your breasts or chest. Never being pregnant or breastfeeding. Starting menopause after age 55. […] Having a risk factor doesn’t mean you’ll get DCIS. For example, although a family history of breast cancer is a risk factor for DCIS, most people with ductal carcinoma in situ don’t have family members with breast cancer. Risk factors are all about probability what may increase your chance of developing a condition.

• #53 Understanding Ductal Carcinoma In Situ (DCIS) | NBCFNational Breast Cancer Foundation logoNational Breast Cancer Foundation logo

  https://nbcf.org.au/about-breast-cancer/diagnosis/ductal-carcinoma-in-situ/

  Ductal carcinoma in situ (DCIS) is considered the earliest form of breast cancer. A diagnosis of DCIS means that abnormal cells have been found within the milk ducts of the breast. At this stage, the cells have not broken through the walls of the milk ducts into the surrounding breast tissue. […] Whilst a diagnosis of DCIS can happen to anyone, there are risk factors associated with all breast cancers that may increase the chance of developing DCIS. These are: Age – the risk increases as your age increases, Previous history of a non-cancerous breast disease, Family history of breast cancer, Increased breast density, Never having been pregnant, Having your first child after age 30, Having the first period early (before age 12), Beginning menopause after age 55, Certain genetic mutations such as BRCA1 and BRCA2. […] There are several known risk factors which may increase the likelihood of developing DCIS, one of which includes a family history of breast cancer.

• #54

  https://www.advocatehealth.com/health-services/cancer-institute/cancers-we-treat/breast-cancer/ductal-carcinoma-in-situ

  Ductal carcinoma in situ (DCIS) is a non-invasive cancer that grows inside the milk ducts of the breast. […] Several factors, such as age, family history and hormonal factors may increase the risk of developing DCIS. […] Women over the age of 50 are more likely to develop DCIS, although it can occur at any age. […] If you have previously been diagnosed with breast cancer in one breast, you may have an increased risk of developing DCIS in the other breast. […] If you’ve had radiation therapy to the chest, particularly during childhood or adolescence, it increases your risk of developing DCIS later in life. […] Factors that affect hormone levels, such as early menstruation, late menopause, never giving birth or having a first child after the age of 30, and using hormone replacement therapy for an extended period, may increase the risk of DCIS. […] Women with dense breast tissue, as seen on mammograms, have a higher risk of developing both DCIS and invasive breast cancer. […] Factors such as obesity, excessive alcohol consumption and a inactive lifestyle may also contribute to an increased risk of DCIS.

• #55 Ductal Carcinoma in Situ (DCIS): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17869-ductal-carcinoma-in-situ-dcis

  Ductal carcinoma in situ (DCIS) happens when healthy cells in your milk duct mutate (change) and grow uncontrollably. But experts aren’t sure why these changes take place to begin with, or why DCIS spreads in some cases but not others. […] Certain factors can increase your risk of ductal carcinoma in situ, like: A biological family history of breast cancer. A personal history of breast cancer or atypical hyperplasia. Being female. Being over age 30. Getting your period before age 12. Having a baby after 30. Having dense breast tissue. Having gene mutations associated with increased cancer risk (BRCA 1 and BRCA 2). Having previous radiation therapy directed at your breasts or chest. Never being pregnant or breastfeeding. Starting menopause after age 55. […] Having a risk factor doesn’t mean you’ll get DCIS. For example, although a family history of breast cancer is a risk factor for DCIS, most people with ductal carcinoma in situ don’t have family members with breast cancer. Risk factors are all about probability what may increase your chance of developing a condition.

• #56 DCIS Breast Cancer: Symptoms, Treatment, Outlook

  https://www.healthline.com/health/breast-cancer/dcis-breast-cancer

  DCIS is considered a stage 0 or preinvasive cancer. In other words, its a precursor to breast cancer. […] Exactly what causes DCIS isnt known. Still, research has shed light on some of the possible factors that may increase your risk of developing a breast cancer diagnosis. […] The following factors may contribute to a higher risk of breast cancer: […] Personal history of breast disease: A history of atypical hyperplasia or lobular carcinoma in situ (LCIS) may increase your risk of breast cancer. […] Family history of breast or ovarian cancer: Having a close relative (parent, sibling, child) who had breast or ovarian cancer raises your risk. […] Radiation therapy: A 2021 study showed that if you had radiation therapy to treat Hodgkin lymphoma, your risk of breast cancer may be higher.

• #57 Ductal Carcinoma in Situ (DCIS): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17869-ductal-carcinoma-in-situ-dcis

  Ductal carcinoma in situ (DCIS) happens when healthy cells in your milk duct mutate (change) and grow uncontrollably. But experts aren’t sure why these changes take place to begin with, or why DCIS spreads in some cases but not others. […] Certain factors can increase your risk of ductal carcinoma in situ, like: A biological family history of breast cancer. A personal history of breast cancer or atypical hyperplasia. Being female. Being over age 30. Getting your period before age 12. Having a baby after 30. Having dense breast tissue. Having gene mutations associated with increased cancer risk (BRCA 1 and BRCA 2). Having previous radiation therapy directed at your breasts or chest. Never being pregnant or breastfeeding. Starting menopause after age 55. […] Having a risk factor doesn’t mean you’ll get DCIS. For example, although a family history of breast cancer is a risk factor for DCIS, most people with ductal carcinoma in situ don’t have family members with breast cancer. Risk factors are all about probability what may increase your chance of developing a condition.

• #58

  https://www.advocatehealth.com/health-services/cancer-institute/cancers-we-treat/breast-cancer/ductal-carcinoma-in-situ

  Ductal carcinoma in situ (DCIS) is a non-invasive cancer that grows inside the milk ducts of the breast. […] Several factors, such as age, family history and hormonal factors may increase the risk of developing DCIS. […] Women over the age of 50 are more likely to develop DCIS, although it can occur at any age. […] If you have previously been diagnosed with breast cancer in one breast, you may have an increased risk of developing DCIS in the other breast. […] If you’ve had radiation therapy to the chest, particularly during childhood or adolescence, it increases your risk of developing DCIS later in life. […] Factors that affect hormone levels, such as early menstruation, late menopause, never giving birth or having a first child after the age of 30, and using hormone replacement therapy for an extended period, may increase the risk of DCIS. […] Women with dense breast tissue, as seen on mammograms, have a higher risk of developing both DCIS and invasive breast cancer. […] Factors such as obesity, excessive alcohol consumption and a inactive lifestyle may also contribute to an increased risk of DCIS.

• #59 DCIS Breast Cancer: Symptoms, Treatment, Outlook

  https://www.healthline.com/health/breast-cancer/dcis-breast-cancer

  DCIS is considered a stage 0 or preinvasive cancer. In other words, its a precursor to breast cancer. […] Exactly what causes DCIS isnt known. Still, research has shed light on some of the possible factors that may increase your risk of developing a breast cancer diagnosis. […] The following factors may contribute to a higher risk of breast cancer: […] Personal history of breast disease: A history of atypical hyperplasia or lobular carcinoma in situ (LCIS) may increase your risk of breast cancer. […] Family history of breast or ovarian cancer: Having a close relative (parent, sibling, child) who had breast or ovarian cancer raises your risk. […] Radiation therapy: A 2021 study showed that if you had radiation therapy to treat Hodgkin lymphoma, your risk of breast cancer may be higher.

• #60 Understanding ductal carcinoma in situ – Harvard Health

  https://www.health.harvard.edu/newsletter_article/understanding-ductal-carcinoma-in-situ

  Most women diagnosed with this noninvasive breast cancer are alive 10 years later, and better treatments are emerging. […] The diagnosis of DCIS describes a cluster of cells captured in the process of evolving from normal tissue to breast cancer. The journey is thought to begin with a series of genetic changes in breast cells. […] Carcinogenesis, the process by which cancer arises, may not take place precisely in these orderly steps. However, pathologists have developed these classifications as indicators of the progression of the disease. […] Ductal carcinoma in situ (DCIS) is an overgrowth of abnormal cells in the milk ducts of the breast. It starts with the proliferation of normal cells lining the milk ducts (ductal hyperplasia); next, the cells within the duct become abnormal and rapidly multiply (atypical ductal hyperplasia); finally, abnormal cells fill the duct (DCIS). […] The data are limited on treating modern DCIS — which is identified by screening mammogram instead of being found rarely in large tumor masses. […] DCIS research is directed mainly at improving treatment and, above all, at preventing progression to invasive disease.

• #61 Understanding ductal carcinoma in situ – Harvard Health

  https://www.health.harvard.edu/newsletter_article/understanding-ductal-carcinoma-in-situ

  Most women diagnosed with this noninvasive breast cancer are alive 10 years later, and better treatments are emerging. […] The diagnosis of DCIS describes a cluster of cells captured in the process of evolving from normal tissue to breast cancer. The journey is thought to begin with a series of genetic changes in breast cells. […] Carcinogenesis, the process by which cancer arises, may not take place precisely in these orderly steps. However, pathologists have developed these classifications as indicators of the progression of the disease. […] Ductal carcinoma in situ (DCIS) is an overgrowth of abnormal cells in the milk ducts of the breast. It starts with the proliferation of normal cells lining the milk ducts (ductal hyperplasia); next, the cells within the duct become abnormal and rapidly multiply (atypical ductal hyperplasia); finally, abnormal cells fill the duct (DCIS). […] The data are limited on treating modern DCIS — which is identified by screening mammogram instead of being found rarely in large tumor masses. […] DCIS research is directed mainly at improving treatment and, above all, at preventing progression to invasive disease.

• #62 Ductal carcinoma in situ (DCIS) | EBSCO Research Starters

  https://www.ebsco.com/research-starters/health-and-medicine/ductal-carcinoma-situ-dcis

  Ductal carcinoma in situ (DCIS) is a noninvasive form of breast cancer that occurs in the milk ducts of the breast. […] It is essential to understand the risk factors, which include age, reproductive history, and family history of breast cancer. […] The use of oral contraceptives and postmenopausal estrogen-progestin replacement therapy over a period of more than five years has been shown to increase the risk of breast cancer. […] Having a family history of early-onset or bilateral disease and carrying the breast cancer susceptibility gene BRCA1 or BRCA2 increase the risks as well. […] Not all DCIS lesions become invasive breast cancer, but DCIS precedes most invasive lesions. […] Most of the genetic changes present in invasive breast cancer are already present in DCIS, suggesting that if left untreated, these tumors would indeed become invasive.

• #63 Progression from ductal carcinoma in situ to invasive breast cancer: molecular features and clinical significance | Signal Transduction and Targeted Therapy

  https://www.nature.com/articles/s41392-024-01779-3

  The major questions in this regard are: (1) does IDC originate from DCIS? and (2) if so, how does DCIS progress during the DCIS-IDC transition? […] The four proposed models of DCIS-IDC transition may answer the former question. The theories regarding DCIS progression have been broadly divided into two categories, namely, genetic and non-genetic. The former posits the crucial role of the neoplastic cell itself while the latter emphasizes on non-genetic factors, particularly the TME. […] The independent lineage model hypothesizes that DCIS and IDC derive from two distinct normal epithelial cells. […] The evolutionary bottleneck model for DCIS-IDC transition hypothesizes that during the transition, only a small proportion of DCIS tumor cells with specific genetic events are selected to form a single clone, which subsequently breaks the evolutionary bottleneck and evolves into IDC.

• #64 Progression from ductal carcinoma in situ to invasive breast cancer: molecular features and clinical significance | Signal Transduction and Targeted Therapy

  https://www.nature.com/articles/s41392-024-01779-3

  The multiclonal invasion model differs from the evolutionary bottleneck model in that it refers to multiple subclones escaping and co-migrating to invasive regions to generate IDC. […] The convergent phenotype model describes that subclones of different genotypes within DCIS may all give rise to an invasive phenotype to establish IDC. […] Emerging evidence suggests that considerable changes in the microenvironment pave the way for DCIS progression. […] Notably, different intrinsic subtypes of DCIS have been reported to be associated with distinct tumor microenvironment (TME) and evolutionary pathways to IDC.

• #65 Progression from ductal carcinoma in situ to invasive breast cancer: molecular features and clinical significance | Signal Transduction and Targeted Therapy

  https://www.nature.com/articles/s41392-024-01779-3

  The multiclonal invasion model differs from the evolutionary bottleneck model in that it refers to multiple subclones escaping and co-migrating to invasive regions to generate IDC. […] The convergent phenotype model describes that subclones of different genotypes within DCIS may all give rise to an invasive phenotype to establish IDC. […] Emerging evidence suggests that considerable changes in the microenvironment pave the way for DCIS progression. […] Notably, different intrinsic subtypes of DCIS have been reported to be associated with distinct tumor microenvironment (TME) and evolutionary pathways to IDC.

• #66 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #67

  https://myhealth.alberta.ca/Health/aftercareinformation/pages/conditions.aspx?HwId=acg4920

  Ductal carcinoma in situ (DCIS) is the growth of abnormal cells in the milk ducts of the breast. It’s an early form of non-invasive breast cancer. Non-invasive means that the cells haven’t spread. Some cases of DCIS will become invasive breast cancer, but it’s impossible to know which ones. […] The exact cause of DCIS isn’t known. Age and family health history may play a part.

• #68 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #69 Invasive Ductal Carcinoma (IDC) and Ductal Carcinoma in Situ (DCIS) Breast Cancer

  https://www.webmd.com/breast-cancer/ductal-carcinoma-invasive-in-situ

  Ductal carcinoma in situ (DCIS), also known as intraductal carcinoma, accounts for 1 of every 5 new breast cancer diagnoses. It’s an uncontrolled growth of cells within the breast ducts. Its noninvasive, meaning it hasn’t grown into the breast tissue outside of the ducts. The phrase „in situ” means „in its original place.” […] Even though its noninvasive, it can lead to invasive cancer. It’s important that those with the disease get treatment. Research shows that the risk of getting invasive cancer is low if you’ve been treated for DCIS. If it isn’t treated, 30% to 50% of those with DCIS will get invasive cancer. The invasive cancer usually develops in the same breast and in the same area where the DCIS happened. […] You and your doctors may decide that a mastectomy to remove the breast is the best course of treatment if you have any of the following: A strong family history of breast cancer, A gene mutation that makes having breast cancer more likely, A very large areas of DCIS, DCIS lesions in multiple areas throughout your breast, Not being able to tolerate radiation therapy. […] You and your treatment team may also consider the use of hormone therapy if the cancer tests positive for hormone receptors (HR+ breast cancer). Hormone therapy is a treatment to block hormones from reaching cancer cells and can cut the chance of getting another breast cancer in either breast.

• #70 Invasive Ductal Carcinoma (IDC) and Ductal Carcinoma in Situ (DCIS) Breast Cancer

  https://www.webmd.com/breast-cancer/ductal-carcinoma-invasive-in-situ

  Ductal carcinoma in situ (DCIS), also known as intraductal carcinoma, accounts for 1 of every 5 new breast cancer diagnoses. It’s an uncontrolled growth of cells within the breast ducts. Its noninvasive, meaning it hasn’t grown into the breast tissue outside of the ducts. The phrase „in situ” means „in its original place.” […] Even though its noninvasive, it can lead to invasive cancer. It’s important that those with the disease get treatment. Research shows that the risk of getting invasive cancer is low if you’ve been treated for DCIS. If it isn’t treated, 30% to 50% of those with DCIS will get invasive cancer. The invasive cancer usually develops in the same breast and in the same area where the DCIS happened. […] You and your doctors may decide that a mastectomy to remove the breast is the best course of treatment if you have any of the following: A strong family history of breast cancer, A gene mutation that makes having breast cancer more likely, A very large areas of DCIS, DCIS lesions in multiple areas throughout your breast, Not being able to tolerate radiation therapy. […] You and your treatment team may also consider the use of hormone therapy if the cancer tests positive for hormone receptors (HR+ breast cancer). Hormone therapy is a treatment to block hormones from reaching cancer cells and can cut the chance of getting another breast cancer in either breast.

• #71 Ductal Carcinoma In Situ (DCIS) | BCRF

  https://www.bcrf.org/about-breast-cancer/dcis-ductal-carcinoma-in-situ/

  Ductal carcinoma in situ (DCIS) is the earliest stage of breast cancer, which is why its sometimes referred to as stage 0 breast cancer. DCIS, by definition, is cancer that starts in the cells lining the milk ducts (carcinoma) and remains in the area where it originates (in situ). DCIS remains in the milk duct and does not spread through the duct walls into the surrounding breast tissue. Stage 0 breast cancer is considered to be a precursor to invasive, stage 14 breast cancers. […] Although DCIS is defined by the area in which it occurs, the lesions can significantly differ from patient to patient and can vary in molecular and histological features, genetics, clinical presentation, and potential to progress to invasive breast cancer. […] If left untreated, some cases of DCIS will transform into invasive breast cancer, but it is uncertain how many. Estimates of DCIS cases that will become invasive breast cancer range from 20-50 percent. Put another way, 50-80 percent of DCIS cases will not become invasive.

• #72 Ductal carcinoma in situ (DCIS): Symptoms, screening, and more

  https://www.medicalnewstoday.com/articles/ductal-carcinoma-in-situ

  Ductal carcinoma in situ (DCIS) occurs in the breast ducts and is a type of stage 0 breast cancer. […] Researchers are unsure of the exact cause of DCIS, though they think it could run in families. […] While this number is relatively high, it may be partly due to the fact that people are living longer and receiving more mammography screenings than ever before. […] The researchers of a 2019 meta-analysis found the chance of developing invasive breast cancer is increased if: a person is premenopausal, there were residual tumor cells after the treatment, the DCIS was previously high grade, or grade III.

• #73 Ductal carcinoma | Canadian Cancer Society

  https://cancer.ca/en/cancer-information/cancer-types/breast/what-is-breast-cancer/cancerous-tumours/ductal-carcinoma

  Ductal carcinoma starts in gland cells in the breast ducts. It is the most common type of breast cancer. […] DCIS may also be called intraductal carcinoma or non-invasive ductal carcinoma. It is the most common type of non-invasive breast cancer. […] Knowing the grade is important as it can help doctors predict how likely DCIS will come back after treatment or turn into an invasive breast cancer. […] Comedo DCIS has cells that look like they have plugs of dead tissue in the centre. This type of DCIS is high grade, which means the cells are growing quickly, and it is more likely to come back after treatment. This type of DCIS is also more likely to become an invasive breast cancer. […] Non-comedo DCIS is low grade or intermediate grade, which means that it is slow growing and less likely to become an invasive breast cancer.

• #74 Ductal Carcinoma in Situ (DCIS): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17869-ductal-carcinoma-in-situ-dcis

  Ductal carcinoma in situ (DCIS) happens when healthy cells in your milk duct mutate (change) and grow uncontrollably. But experts aren’t sure why these changes take place to begin with, or why DCIS spreads in some cases but not others. […] Certain factors can increase your risk of ductal carcinoma in situ, like: A biological family history of breast cancer. A personal history of breast cancer or atypical hyperplasia. Being female. Being over age 30. Getting your period before age 12. Having a baby after 30. Having dense breast tissue. Having gene mutations associated with increased cancer risk (BRCA 1 and BRCA 2). Having previous radiation therapy directed at your breasts or chest. Never being pregnant or breastfeeding. Starting menopause after age 55. […] Having a risk factor doesn’t mean you’ll get DCIS. For example, although a family history of breast cancer is a risk factor for DCIS, most people with ductal carcinoma in situ don’t have family members with breast cancer. Risk factors are all about probability what may increase your chance of developing a condition.

• #75 DCIS Breast Cancer: Symptoms, Treatment, Outlook

  https://www.healthline.com/health/breast-cancer/dcis-breast-cancer

  DCIS is considered a stage 0 or preinvasive cancer. In other words, its a precursor to breast cancer. […] Exactly what causes DCIS isnt known. Still, research has shed light on some of the possible factors that may increase your risk of developing a breast cancer diagnosis. […] The following factors may contribute to a higher risk of breast cancer: […] Personal history of breast disease: A history of atypical hyperplasia or lobular carcinoma in situ (LCIS) may increase your risk of breast cancer. […] Family history of breast or ovarian cancer: Having a close relative (parent, sibling, child) who had breast or ovarian cancer raises your risk. […] Radiation therapy: A 2021 study showed that if you had radiation therapy to treat Hodgkin lymphoma, your risk of breast cancer may be higher.

• #76

  https://www.advocatehealth.com/health-services/cancer-institute/cancers-we-treat/breast-cancer/ductal-carcinoma-in-situ

  Ductal carcinoma in situ (DCIS) is a non-invasive cancer that grows inside the milk ducts of the breast. […] Several factors, such as age, family history and hormonal factors may increase the risk of developing DCIS. […] Women over the age of 50 are more likely to develop DCIS, although it can occur at any age. […] If you have previously been diagnosed with breast cancer in one breast, you may have an increased risk of developing DCIS in the other breast. […] If you’ve had radiation therapy to the chest, particularly during childhood or adolescence, it increases your risk of developing DCIS later in life. […] Factors that affect hormone levels, such as early menstruation, late menopause, never giving birth or having a first child after the age of 30, and using hormone replacement therapy for an extended period, may increase the risk of DCIS. […] Women with dense breast tissue, as seen on mammograms, have a higher risk of developing both DCIS and invasive breast cancer. […] Factors such as obesity, excessive alcohol consumption and a inactive lifestyle may also contribute to an increased risk of DCIS.

• #77 Ductal Carcinoma in Situ (DCIS): Symptoms & Treatment

  https://my.clevelandclinic.org/health/diseases/17869-ductal-carcinoma-in-situ-dcis

  Ductal carcinoma in situ (DCIS) happens when healthy cells in your milk duct mutate (change) and grow uncontrollably. But experts aren’t sure why these changes take place to begin with, or why DCIS spreads in some cases but not others. […] Certain factors can increase your risk of ductal carcinoma in situ, like: A biological family history of breast cancer. A personal history of breast cancer or atypical hyperplasia. Being female. Being over age 30. Getting your period before age 12. Having a baby after 30. Having dense breast tissue. Having gene mutations associated with increased cancer risk (BRCA 1 and BRCA 2). Having previous radiation therapy directed at your breasts or chest. Never being pregnant or breastfeeding. Starting menopause after age 55. […] Having a risk factor doesn’t mean you’ll get DCIS. For example, although a family history of breast cancer is a risk factor for DCIS, most people with ductal carcinoma in situ don’t have family members with breast cancer. Risk factors are all about probability what may increase your chance of developing a condition.

• #78 Ductal Carcinoma in Situ (DCIS): What It Is, Causes, Symptoms & Treatment

  https://www.healthday.com/a-to-z-health/women-health/dcis-breast-cancer-2662746292.html

  While it isnt clear what causes DCIS breast cancer, researchers do know that it occurs when there are genetic mutations in the DNA of the milk duct cells. […] Though experts dont yet know what triggers these mutations, according to Mayo Clinic, there are some risk factors associated with DCIS. These include the following: Increasing age, Personal history of benign breast disease, such as atypical hyperplasia, Family history of breast cancer, Never having been pregnant, Having your first baby after age 30, Having your first period before age 12, Beginning menopause after age 55, Genetic mutations that increase the risk of breast cancer, such as those in the breast cancer genes BRCA1 and BRCA2.

• #79 DCIS Breast Cancer: Symptoms, Treatment, Outlook

  https://www.healthline.com/health/breast-cancer/dcis-breast-cancer

  DCIS is considered a stage 0 or preinvasive cancer. In other words, its a precursor to breast cancer. […] Exactly what causes DCIS isnt known. Still, research has shed light on some of the possible factors that may increase your risk of developing a breast cancer diagnosis. […] The following factors may contribute to a higher risk of breast cancer: […] Personal history of breast disease: A history of atypical hyperplasia or lobular carcinoma in situ (LCIS) may increase your risk of breast cancer. […] Family history of breast or ovarian cancer: Having a close relative (parent, sibling, child) who had breast or ovarian cancer raises your risk. […] Radiation therapy: A 2021 study showed that if you had radiation therapy to treat Hodgkin lymphoma, your risk of breast cancer may be higher.

• #80 Ductal & Lobular Carcinoma In Situ: Are They Breast Cancer?

  https://www.rockymountaincancercenters.com/blog/ductal-lobular-carcinoma-in-situ-are-they-breast-cancer

  If youve had a recent breast biopsy that came back with abnormal findings theres a chance that its very early stage breast cancer called ductal carcinoma in situ (DCIS), or an abnormal growth of cells called lobular carcinoma in situ (LCIS). […] DCIS stands for ductal carcinoma in situ. This is a type of early-stage breast cancer, sometimes referred to as stage 0. Its found in the milk ducts of the breast and is isolated to only the milk ducts. This is considered non-invasive breast cancer. If left untreated, cancer cells associated with ductal carcinoma in situ can change and become an invasive breast cancer, which can spread. […] The short answer is yes, your likelihood of developing invasive cancer later in life goes up with both DCIS and LCIS. […] A Harvard Medical School study found that having DCIS more than doubled the risk of developing invasive breast cancer. […] The American Cancer Society estimates that women with LCIS are 7 to 12 times more likely to develop invasive cancer in either breast compared to the average population.

• #81 Ductal & Lobular Carcinoma In Situ: Are They Breast Cancer?

  https://www.rockymountaincancercenters.com/blog/ductal-lobular-carcinoma-in-situ-are-they-breast-cancer

  If youve had a recent breast biopsy that came back with abnormal findings theres a chance that its very early stage breast cancer called ductal carcinoma in situ (DCIS), or an abnormal growth of cells called lobular carcinoma in situ (LCIS). […] DCIS stands for ductal carcinoma in situ. This is a type of early-stage breast cancer, sometimes referred to as stage 0. Its found in the milk ducts of the breast and is isolated to only the milk ducts. This is considered non-invasive breast cancer. If left untreated, cancer cells associated with ductal carcinoma in situ can change and become an invasive breast cancer, which can spread. […] The short answer is yes, your likelihood of developing invasive cancer later in life goes up with both DCIS and LCIS. […] A Harvard Medical School study found that having DCIS more than doubled the risk of developing invasive breast cancer. […] The American Cancer Society estimates that women with LCIS are 7 to 12 times more likely to develop invasive cancer in either breast compared to the average population.

• #82 DCIS breast cancer (Ductal carcinoma in situ) | Macmillan Cancer Support

  https://www.macmillan.org.uk/cancer-information-and-support/breast-cancer/ductal-carcinoma-in-situ-dcis

  DCIS is likely to be caused by a combination of different risk factors, rather than just 1 risk factor. […] The exact cause of DCIS is unknown. But certain things can increase the chance of developing it. These are called risk factors. The risk factors for DCIS and invasive breast cancer are similar. […] Having 1 or more risk factors does not mean you will definitely get DCIS. And if you do not have any risk factors, it does not mean you will not get DCIS.

• #83 Ductal carcinoma in situ (DCIS) – Symptoms and causes – Mayo Clinic

  https://www.mayoclinic.org/diseases-conditions/dcis/symptoms-causes/syc-20371889

  Ductal carcinoma in situ is a very early form of breast cancer. In ductal carcinoma in situ, the cancer cells are confined inside a milk duct in the breast. The cancer cells haven’t spread into the breast tissue. […] It’s not clear what causes ductal carcinoma in situ, also called DCIS. This early form of breast cancer happens when cells inside a breast duct develop changes in their DNA. […] Healthcare professionals don’t know exactly what causes the changes in the cells that leads to DCIS. Factors that may play a part include lifestyle, environment and DNA changes that run in families.

• #84 Ductal Carcinoma In Situ of the Breast

  https://pmc.ncbi.nlm.nih.gov/articles/PMC4484537/

  Ductal carcinoma in situ (DCIS) of the breast is a potentially invasive neoplasm. Risk factors include high estrogen states such as use of oral contraceptive (OC) pills, nulliparity, advanced age at first birth, and also family history and genetic mutations. […] Increased exposure to estrogen, related to use of oral contraceptive (OC) pills, nulliparity, older age at first birth, or use of hormone replacement therapy (HRT) after menopause are associated with an increased risk for DCIS. […] Familial factors include family history of DCIS/invasive cancer. Mutations in the BRCA1 or BRCA2 genes have been implicated, which significantly increase the risk of developing DCIS/invasive disease. […] Various factors have been implicated in the development of the condition. Chromosomal imbalances including loss of heterozygosity occur in more than 70 % of high-grade carcinomas.

• #85 Ductal Carcinoma In Situ (DCIS) – National Breast Cancer Foundation

  https://www.nationalbreastcancer.org/dcis/

  Environmental and lifestyle risk factors for DCIS include: Lack of physical activity: A sedentary lifestyle can increase the risk of breast cancer. Obesity: Being overweight or obese can increase the risk of breast cancer, especially for older women. Poor diet: A diet low in fruits and vegetables can increase the risk of breast cancer. Drinking alcohol or smoking: Drinking and smoking can lead to an increased risk of developing breast and other types of cancer. Combined hormone replacement therapy (HRT): Taking combined HRT for more than 5 years can increase the risk of developing breast cancer. […] If left untreated or undetected, DCIS may spread out of the milk ducts and into the surrounding breast tissue. When DCIS spreads beyond the milk ducts and invades other areas of the breast, it becomes invasive ductal carcinoma (IDC) and advances in stage.

• #86 Ductal Carcinoma In Situ (DCIS) | BCRF

  https://www.bcrf.org/about-breast-cancer/dcis-ductal-carcinoma-in-situ/

  Currently, our ability to stratify DCIS by risk is in its early stages. At this point, the standard of care is to reduce risk as much as possible by treating DCIS like early-stage breast cancer, typically with the combination of surgery, radiation, and hormone therapy depending on the case. […] Understanding the process by which DCIS becomes invasive breast cancer and uncovering predictors of progression are critical to improving DCIS treatment guidelines and may even offer insights into breast cancers origins.

• #87 Genetic predisposition to ductal carcinoma in situ of the breast | Breast Cancer Research | Full Text

  https://breast-cancer-research.biomedcentral.com/articles/10.1186/s13058-016-0675-7

  Ductal carcinoma in situ (DCIS) is a non-obligate precursor of invasive breast cancer including invasive ductal/no special type carcinomas (IDC). […] It is hypothesized in the majority of these cases that the invasive component has arisen from the DCIS as they generally share the same somatic genetic changes. […] Most non-genetic risk factors for breast cancer have similar associations with DCIS and IDC, supporting the notion that DCIS is a precursor of invasive cancer. […] There is also evidence from epidemiological studies that there is an inherited predisposition to DCIS. […] A small part of this inherited predisposition is explained by BRCA1/2 mutations, as mutations in these genes are found in a similar proportion of DCIS and invasive breast cancer cases. […] It is now evident that some low-risk susceptibility loci are associated with different pathological subtypes of breast cancer and support the hypothesis that breast tumor subtypes arise through distinct molecular pathways.

• #88 Genetic predisposition to ductal carcinoma in situ of the breast | Breast Cancer Research | Full Text

  https://breast-cancer-research.biomedcentral.com/articles/10.1186/s13058-016-0675-7

  This study provides the strongest evidence to date for a shared genetic susceptibility between DCIS and IDC, based on 5,067 cases with pure DCIS (no invasive disease) and 24,670 cases with IDC. […] An important finding of this study is the lack of DCIS/IDC-specific loci among the known breast cancer predisposition loci. […] This lack of DCIS/IDC-specific loci is in contrast to our previous study of lobular cancer in which we showed that there are loci that are specific to invasive lobular cancer (ILC), showing no association with lobular carcinoma in situ (LCIS) and there was also a suggestion of LCIS-specific loci. […] We have also shown for the first time that seven of the known invasive breast cancer predisposition loci not previously shown to be associated with DCIS have comparable ORs for IDC and DCIS.

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