One possible Kevetrin application.
"When you had surgery to remove the original breast cancer, your surgeon removed all the cancer that could be seen and felt. But tests for cancer aren't sensitive enough to detect a tiny group of single cancer cells. These isolated cells may survive radiation therapy and chemotherapy aimed at preventing recurrence. Even a single cell that escaped treatment may be able to spread and grow into a tumor."

http://www.breastcancer.org/symptoms/types/recur_metast