Second cancers are on the rise. Nearly 1 in 5 new cases in the U.S. now involves someone who has had the disease before. Cancer recurrence has a different approach from doctors. But when they speak on second cancers, they're referring to cancer occurring in a different tissue type or completely other site in the body, not recurrence or spread of the original tumor. Almost 19% of cancers in the United States are second-or-more cases, according to a recent study. In the 1970s, it was only 9 percent. Over that period, what changed? Could it be lifestyle factors, the rise of obesity contributing to diabetes and other cardiovascular diseases? Over the course of 40 years, that number rose 70%, while the number of second cancers rose 300%.
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