How Common is Breast Cancer?
Breast cancer is the most common malignancy affecting American women with one in eight women diagnosed during their lifetime (12.5% risk). There are several risk factors that can affect a woman’s risk, some of which are modifiable while others are out of our control.
Modifiable Risk Factors:
- Body Mass Index (BMI) – Weight can significantly increase a woman’s risk for developing breast cancer as adipose aka fat tissue stores estrogen. Being overweight or obese increases estrogen exposure as well as cancer risk. It is important to maintain a healthy BMI to not only lower your breast cancer risk, but also decrease the risk of cancer recurrence if you are a breast cancer survivor. Your diet plays into this as well so it is important to eat a balanced, nutritious diet and avoid processed foods.
- Alcohol consumption – This is an exponential risk factor in that the more alcohol you consume, the higher the risk of developing breast cancer. You should limit your intake to less than 3 to 4 drinks per week.
- Tobacco use – As with most malignancies, nicotine use increases breast cancer risk. It also inhibits wound healing, so it is important to quit all nicotine products before undergoing surgical management.
- Physical Activity – A sedentary lifestyle can increase your risk for breast cancer as well. Ideally, you should increase your exercise routine to 300 minutes per week, but risk reduction is observed at 150 minutes per week.
- Hormone Replacement Therapy – Combination HRT (estrogen/ progesterone) increases breast cancer risk. Most women must stop these medications once diagnosed. It is especially important to perform routine self-breast exams and screening mammograms while taking HRT.
Non-modifiable Risk Factors:
- Age – Breast cancer is an aging woman’s disease with a majority of cases diagnosed after the age of 50.
- Gender – Women are overwhelmingly more affected by breast cancer than men, but men constitute 2% of all breast cancer diagnoses each year so it is important for men to practice breast awareness as well.
- Genetics & Family History– Certain genetic mutations can increase a woman or man’s risk of developing breast cancer. Most people are aware of the BRCA1 and BRCA2 genes, but there are several other genes that increase this risk as well (CHEK2, PALB2, ATM to name a few). Even if genetic testing is negative for these mutations, patients are still considered to be at a higher risk than the general population if they have a family history of breast cancer.
- Lifetime Estrogen Exposure – Starting menstruation before the age of 12, menopause at a later age, and delaying childbearing after the age of 30 or not having any children all lead to increased estrogen exposure and ultimately breast cancer risk.
- Atypical breast cells – Not every breast biopsy is malignant; many are benign like fibroadenomas or cysts. There are some biopsies considered high risk lesions like atypical ductal and lobular hyperplasia and lobular carcinoma in situ.
While breast cancer rates have been increasing over the years, the good news is that more and more women are surviving this diagnosis. This is largely due to increased patient awareness and early detection as well as improved and increasing treatment options. If you have been diagnosed with breast cancer or a genetic mutation and are considering breast reconstruction surgery, reach out to us at our Fort Worth, Austin or Oklahoma City offices. At Breast Reconstruction Associates, we are committed to our patients’ overall health and reconstructive goals.
FAQs
While breast cancer can develop at any age, most cases occur in women over 50. Current guidelines recommend that women with average risk discuss screening options with their healthcare provider starting at age 40-45, though individualized screening plans depend on personal risk factors, family history, and medical preferences. Women with higher genetic risk or family history may need earlier screening and more frequent imaging.
Unfortunately, breast cancer cannot be completely prevented since some risk factors like age, genetics, and gender cannot be changed. However, significant risk reduction is possible through lifestyle modifications. Women who maintain a healthy weight, exercise regularly, limit alcohol, avoid smoking, and reduce hormone exposure can substantially lower their breast cancer risk compared to those with multiple risk factors.
Having a close relative (mother, sister, daughter) diagnosed with breast cancer increases your risk, even without carrying known genetic mutations. The risk elevation is greater if multiple family members were diagnosed, if diagnoses occurred before age 50, or if relatives had cancer in both breasts. Genetic counseling and testing may be recommended to determine if you carry mutations that significantly increase lifetime risk.
Combination hormone replacement therapy (containing both estrogen and progesterone) carries an increased breast cancer risk compared to estrogen-only therapy or non-hormonal alternatives. Women considering HRT should discuss their individual risk profile with their doctor, explore alternative symptom management options, and if HRT is chosen, plan for enhanced monitoring with regular clinical exams and imaging.
Yes, physical activity provides measurable protection against breast cancer development and recurrence. Research shows risk reduction benefits begin at 150 minutes of moderate weekly exercise, with additional protective effects at 300 minutes weekly. The benefits appear linked to improved weight management, reduced inflammation, and better hormonal balance.
Estrogen exposure over a woman’s lifetime significantly influences breast cancer risk. Longer reproductive years—from early menstruation to late menopause—increase cumulative estrogen exposure. Additionally, body fat produces estrogen, so excess weight elevates estrogen levels. Understanding this connection helps explain why maintaining healthy weight, having children, and managing reproductive timeline all influence risk.
Not all abnormal cells found on breast biopsy become cancer, but certain types—like atypical hyperplasia or lobular carcinoma in situ—carry higher risk of developing into malignant disease compared to benign conditions like cysts or fibroadenomas. These high-risk lesions often warrant closer surveillance, enhanced screening protocols, and sometimes preventive medication to monitor for future development.
