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BREAST CANCER

ESSENTIALS OF DIAGNOSIS

  • Lobular or ductal carcinoma in situ are localized breast cancers.

  • Invasive breast cancer extends beyond the ducts and lobules and may present as a palpable mass.

  • Inflammatory breast cancers can be mistaken for skin infection.

  • Guidelines for early detection have evolved significantly.

General Considerations

Breast cancer is the second most common cancer in women after skin cancer. BRCA1 and BRCA2 tumor suppressor genes confer strong risk. Other risk factors include earlier age of menarche, later age of menopause, nulliparity, and late age of first birth, all reflecting higher total number of ovarian cycles. Obesity, alcohol use, older age, decreased physical activity, and other genetic and environmental factors have been linked to breast cancer. Recent studies challenge hormone replacement therapy (HRT) as a risk for breast cancer.

*This publication does not reflect the views or opinions of the US Army or the Department of Defense.

Prevention

Women positive for the heritable BCRA mutation may benefit from prophylactic tamoxifen and prophylactic total mastectomy. AAFP recommends that women whose family history is associated with an increased risk for BRCA mutation be referred for genetic counseling and evaluation for BRCA testing (Table 27-1). Neither routine testing nor prophylactic medication is recommended for the general population. Smoking is a risk factor for cancer development, and cessation should be recommended in all current smokers.

Table 27–1.Indications for genetic referral for BRCA testing.

Clinical Findings

Breast cancer most commonly presents as a painless, irregularly bordered mass. Other presentations may include local swelling, dimpling, breast pain, and skin and nipple changes as well as nipple discharge. Advanced clinical presentations may include pain and/or fracture from bony metastasis.

Differential Diagnosis

A. Clinically Evident Mass

A concerning breast mass can be further evaluated through diagnostic mammography, ultrasound with or without fine-needle aspiration, and/or ductal lavage and/or ductogram. Genetic and hormonal receptor testing further differentiates breast cancers.

B. Preclinical Detection

Screening guidelines for normal- and high-risk women have evolved considerably, balancing benefits of early detection against the anxiety, financial loss, and morbidity of false positive screening. Table 27-2 outlines recommendations of several organizations.

Table 27–2.Breast cancer screening.

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