The study will target twenty (20) women with newly diagnosed breast cancer who are scheduled to undergo biopsy of additional suspicious lesions that were identified on standard of care contrast- enhanced breast MRI. Prior to the biopsy, these subjects will receive a Tc-MBI scan of the breast. The results from both imaging methods will be compared to histological findings. These results may be used to design larger and more comprehensive studies with an overarching goal to determine if there is a role for Tc-MBI in the pre-operative evaluation of patients with known breast cancer.