Recurring cancers in women with a history of breast cancer differ from the original tumors

When women with a history of breast cancer learn they have breast cancer again, one of the first questions they ask is: Is my cancer back, or is this a new case? Now, new data suggest that new and recurring cancers differ significantly from the original tumors, regardless of how many months or years women spent cancer-free, and doctors should tailor treatment to the specific qualities of the second tumor.

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