What's going on HER2過剰発現転移性乳がんに対するトラスツズマブとビノレルビンあるいはタキサン併用療法試験[Burstein HJ, Keshaviah A, Baron AD, Hart RD, Lambert-Falls R, Marcom PK, Gelman R, Winer EP 'Trastuzumab plus vinorelbine or taxane chemotherapy for HER2-overexpressing metastatic breast cancer: the trastuzumab and vinorelbine or taxane