This study evaluates the addition melatonin and metformin to conventional chemotherapy FDC (Fluoruracil, Doxorubicin, cyclophosphamide) in the treatment of locally advanced breast cancer. Third of patients will receive FDCх6 cycles, other third will receive combination of melatonin and FDCх6 cycles and other patients will receive combination of metformin and FDCх6 cycles.