Breast Cancer

Abstract
Breast cancer is the most common cancer diagnosis and the second leading cause of cancer death among women in the United States. Over 211,000 women and 1,600 men in the United States are diagnosed with breast cancer each year, and 40,000 Americans die of this disease annually. This chapter reviews the epidemiology of breast cancer. Topics covered include classification, demographic patterns, environmental factors, host factors, pathogenesis, and preventive measures.