...biosimilar of trastuzumab (BT) in the neoadjuvant chemotherapy in HER2+ breast cancer (BC)...The rate of pCR was 55,6% (breast) and 45,8% (breast and lymph nodes). The rate of pCR was the same in women with primary-operable and locally-advance stages (58,6 vs 52%, p = 0,625), as well as in luminal and non-luminal BC (54,2 vs 56,7%, p = 0,854)...Neoadjuvant chemotherapy with BT was effective...