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Breast Cancer Risk Factors and Testing for Breast Cancer The very common type of cancer among women in the United States is breast cancer, except skin cancer. Each year, in the United States not less than 200,000 women are treated with breast cancer. Breast cancer is the very common cancer in female and is rare in people younger than 40 years and becomes more common with age and accounts for 1 in 8 cancers diagnosed in women each year. Breast Cancer is also one of the principal causes of death in women.