There is evidence of an increased risk of breast cancer for women under age 35 who are recent users of OCs (see section on Breast Cancer). Studies have consistently shown that using OCs reduces the risk of ovarian cancer (see section on Ovarian and Endometrial Cancers). There is evidence that long-term use of OCs may increase the risk of cancer of the cervix (see section on Cancer of the Cervix). There is some evidence that OCs may increase the risk of certain cancerous liver tumors (see section on Liver Tumors).
http://cis.nci.nih.gov/fact/3_13.htm
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