SnuffThe American College of Obstetricians and Gynecologists...

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The American College of Obstetricians and Gynecologists (ACOG) Committee on Gynecologic Practice also reviewed the available evidence in 2003 and again in 2009. ACOG published its most recent findings in June 2009. At that time, the Committee said, “Early studies of the relationship between prior induced abortion and breast cancer risk were methodologically flawed. More rigorous recent studies demonstrate no causal relationship between induced abortion and a subsequent increase in breast cancer risk.”
http://www.cancer.org/cancer/breastcancer/moreinformation/is-abortion-linked-to-breast-cancer