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Hormonal and reproductive history factors that increase the risk of breast cancer include factors that may allow breast tissue to be exposed to high levels of hormones for longer periods of time, such as the following:Beginning menstruation at an early ageExperiencing menopause at a late ageLater age at first pregnancyNot having children at allA 1996 analysis of epidemiologic data from more than 50 studies worldwide by the Collaborative Group on Hormonal Factors in Breast Cancer found that women who were current or recent users of birth control pills had a slightly higher risk of developing breast cancer than women who had never used the pill (2). viagra thailand prescription generic viagra meaning cialis generic warning