Mouse moms exposed late in pregnancy to heavy doses of a carcinogen gave birth to pups that inevitably developed lymphomas and lung cancers, a new study shows. The malignancies generally didn’t show up until the offspring reached the human equivalent of adulthood. The good news: Milk from carcinogen-treated mouse moms posed little added risk.
This demonstration “that very short early-life exposures can have major consequences is very important,” observes toxicologist Linda S. Birnbaum of the Environmental Protection Agency in Research Triangle Park, N.C.
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