factores de riesgo del cáncer de mama

Breast cancer risk factors range from fixed risk factors like age, genetics, and family history to lifestyle-related factors, which can be modified to reduce risk.

While having one or more risk factors does not guarantee developing the disease, understanding these influences is crucial for early detection and informed preventive care.

Being born female - This is the single greatest risk factor; breast cancer is much more common in women than men.

Gene mutations* - Inherited mutations like BRCA1 or BRCA2 account for 5-10% of all breast cancers; dramatically increases lifetime risk.

Family history* - Risk nearly doubles with one first degree relative (mother, sister, daughter).

Dense breast tissue* - Increases risk 4-6x compared to fatty breasts; also masks tumors on mammograms.

Personal history of breast cancer* - Increases risk of developing a new, separate breast cancer.

Reproductive factors (early menarche, late menopause) - Longer lifetime exposure to estrogen increases risk.

Pregnancy history (nulliparity or first birth after 30) - Never being pregnant OR having first child after 30 both confer slightly higher risk.

Radiation exposure (chest)* - Especially harmful if exposure occurs before age 30.

DES exposure (in utero or prescribed) - Daughters of women who took DES have a slightly increased risk.

Race/Ethnicity - White women have highest incidence; Black women have highest mortality.

Tyrer-Cuzick risk score (IBIS) ≥ threshold* - A clinical model that incorporates family history, genetics, atypia, and reproductive factors to assess 10-year and lifetime risk.

Hormone replacement therapy (HRT) - Combined estrogen-progestin therapy >5 years increases risk more than estrogen alone.
Alcohol consumption - Risk increases with each drink per day (approx. 7-10% per drink).
Overweight/Obesity (postmenopausal) - Fat tissue produces estrogen, which fuels hormone-receptor positive cancers.
Insufficient physical activity - Regular exercise reduces risk, likely via hormone and immune effects.
Smoking (long-term, early onset) - Heavy, long-term smoking, especially starting young, modestly increases risk.
Type 2 diabetes (postmenopausal) - Associated with approximately 20-27% higher risk.
Night shift work (long-term) - Circadian disruption and melatonin suppression may increase risk.

Wearing a bra (with or without underwire).
Abortion (induced or spontaneous/miscarriage).
Breast Implants (implants can obstruct mammography images and should be noted during scheduling so additional images can be captured).
Having larger breasts.
Using antiperspirants or deodorants (no scientific evidence linking these to breast cancer)
Having no family history (70-85% of people who have breast cancer have no family history of the disease).
Consuming sugar, caffeine, or soy (while sugar doesn't cause cancer, a diet high in sugar can lead to obesity, which is a risk factor).
Experiencing a bump or injury to the breast (although it may lead to benign lumps).
In vitro fertilization (IVF).