The following was taken from www.nih.gov
multifocal breast cancer
(mul-tee-FO-kal)
Breast cancer in which there is more than one tumor, all of which have arisen from one original tumor. The tumors are likely to be in the same quadrant (section) of the breast.
It would seem to me that your treatment options would be the same as if you had only one tumor.
Regards
Joe