Oral contraceptives may influence the risk of certain cancers. As part of the AHRQ Evidence
Report, Oral Contraceptive Use for the Primary Prevention of Ovarian Cancer, we conducted …

Breast cancer is the most common cancer of adolescents and young adult (AYA) women
aged 15 to 39 years, accounting for 5.6% of all invasive breast cancer in women. In …

Background Little is known about whether contemporary hormonal contraception is
associated with an increased risk of breast cancer. Methods We assessed associations …

Background: Identifying risk factors for breast cancer specific to women in their 40s could
inform screening decisions. Purpose: To determine what factors increase risk for breast …

Approximately 7% of women with breast cancer are diagnosed before the age of 40 years,
and this disease accounts for more than 40% of all cancer in women in this age group …

Risk factors for the newly identified “intrinsic” breast cancer subtypes (luminal A, luminal B,
basal-like and human epidermal growth factor receptor 2-positive/estrogen receptor …

Breast cancers classified by estrogen receptor (ER) and/or progesterone receptor (PR)
expression have different clinical, pathologic, and molecular features. We examined existing …

The etiology of breast cancer might be explained by 2 mechanisms, namely, differentiation
and proliferation of breast epithelial cells mediated by hormonal factors. We performed a …

Introduction Breast cancers are increasingly recognized as heterogeneous based on
expression of receptors for estrogen (ER), progesterone (PR), and human epidermal growth …

Background: Previous studies convincingly showed an increase in risk of breast cancer
associated with current or recent use of oral contraceptives from the 1960s to 1980s. The …