Invasive Carcinoma Breast at Risk Modifiers of Risk
Nonproliferative Breast Changes 1.0 Neither
Duct ectasia
Cysts
Apocrine change
Mild hyperplasia
Adenosis
Fibroadenoma without complex features
Proliferative Disease Without Atypia 1.5–2.0 Both breasts Increased risk if there is a family history of breast carcinoma
Moderate or florid hyperplasia Decreased risk 10 years after biopsy
Sclerosing adenosis
Papilloma
Complex sclerosing lesion (radial scar)
Fibroadenoma with complex features
Proliferative Disease with Atypia 4.0–5.0 Both breasts Increased risk if there is a family history of breast carcinoma
Atypical ductal hyperplasia Increased risk if premenopausal
Atypical lobular hyperplasia Decreased risk 10 years after biopsy for ALH
Carcinoma in Situ 8.0–10.0
Lobular carcinoma in situ Both breasts Treatment (tamoxifen, bilateral mastectomy)
Ductal carcinoma in situ * Ipsilateral breast Treatment (tamoxifen, surgery to eradicate the lesion,
radiation therapy)
*This risk applies to low-grade DCIS originally misdiagnosed as benign disease and followed without treatment. The risk for progression of high-grade DCIS is presumed to be greater
than this.
INCIDENCE AND EPIDEMIOLOGY
After remaining constant for many years (except for a transient rise in 1974 attributed to increased awareness after the publicity surrounding Betty Ford and Happy Rockefeller developing
breast cancer), the incidence of breast cancer
Figure 23-13Breast cancer incidence and mortality rates for women over 50 years of age. Rates are per 100,000 women and are age-adjusted to the 2000 U.S. standard million population.
(SEER Cancer Statistics Review 1973–1999; http://seer.cancer.gov/.)
Figure 23-14Change in stage of breast cancer at presentation from 1983 to 1996. (SEER Cancer Statistics Review, http://seer.cancer.gov/.)
Families with breast cancer due to a single gene (%) 52% 32%
Families with breast and ovarian cancer (%) 81% (20–40% risk) 14% (10–20% risk)
Families with male and female breast cancer <20% 76%
Risk of other tumors (varies with specific mutation) Prostate, colon, pancreas Prostate, pancreas, stomach, melanoma, colon
Mutations in sporadic breast cancer Very rare (<5%) Very rare (<5%)
Epidemiology Specific mutations are found in certain
ethnic groups
Specific mutations are found in certain ethnic groups
Pathology of breast cancers Greater incidence of medullary carcinomas
(13%), poorly differentiated carcinomas,
ER-, PR-, and Her2/neu-negative
carcinomas, carcinomas with p53 mutations
Similar to sporadic breast cancers
Additional information about these genes can be found at http://www.ncbi.nlm.nih.gov/.
cancer, and cataracts. Current clinical trials are attempting to identify other selective estrogen receptor modulators (SERMs) that have the same benefit but fewer side effects.