Fat-derived stem cells can be safely used to aid reconstruction of breast tissue after mastectomy as long as there is no evidence of active cancer,
- "Our research suggests that this risk is real if the patient still has active tumor cells, but is safe when the cells are inactive or resting."
Fat stem cells safe for breast reconstruction when cancer is dormant, says Pitt team
http://www.eurekalert.org/pub_releases/2010-09/uops-fsc091610.php