Evaluation of the efficacy of Trastuzumab in patients with HER2 positive small (pT1mi/a) breast cancers. A multicenter retrospective study on 100 patients. (April 2021) - Villasco, A.; Actis, S.; Borella, F.; D'Alonzo, M.; Ponzone, R.; De Sanctis, C.; Benedetto, C.; Biglia, N.