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There's some evidence to suggest that stem cells cause cancer. A scientist looked at cancers from transplant recipients where the donor was the opposite sex. If the sex chromosomes of the cancer cells were not the same as the gender of the host, then the presumption was that stem cells from the transplant moved elsewhere and caused cancer.
And who needs breast augmentation anyway? I can't imagine wanting foreign bodies implanted in one's own body, especially after cancer. (And yep, I'm likely to get breast cancer, based on my genetic heritage)