NEW YORK (Reuters Health) - Oral contraceptive (OC) use is a risk factor for premenopausal breast cancer, according to pooled data published in the journal Mayo Clinic Proceedings.

• 纽约（路透社）消息??口服避孕药（OC）是绝经前女性患乳腺癌的危险因素之一，据《梅奥临床进展杂志》报道。