Sorry to hear about your problem. Sternal metastasis
from breast cancer
could be due to two reasons. Either it is due to local invasion of the bone or bonny mets. In either case the treatment remains the same. If the lesion is localised and there are no other mets in the body, an excision can be done. if there are mets in the other parts of the body as well, then only chemotherapy
therapy can be offered.
Hoping for the best.