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Lymphoma and Leukemia – – two types of blood tumor – – are among the most common childhood cancers. But unlike adult cancers, which arise after years of lifestyle options and environmental exposures, most childhood cancers ‘just happen,’ said Dr. Ziad Khatib, a pediatric oncologist at Nicklaus Children’s Medical center in Miami. ‘We think most cancers in children are because of chance,’ said Khatib, who was not mixed up in study. But as the new review shows, he said, numerous studies have found an association between pesticides and particular childhood cancers. Plus, it’s biologically plausible that the chemical substances could contribute to cancer in certain vulnerable kids, Khatib added.