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Myth: Fertility treatments increase the risk of getting breast cancer.

Reality: Given estrogen's connection to breast cancer, fertility treatments have come under suspicion. But several studies have found that prospective moms are likely to have no higher risk of breast cancer. As yet, no large, long-term, randomized studies have eliminated this concern entirely; it merits more research to find a definite answer.

Next: Myth: Living near power lines can cause breast cancer.