Perez EA, Romond EH, Suman VJ, Jeong JH, Sledge G, Geyer CE, Jr., et al. Trastuzumab plus adjuvant chemotherapy for human epidermal growth factor receptor 2-positive breast cancer: planned joint analysis of overall survival from NSABP B-31 and NCCTG N9831. The gene discussed is ERBB2; the disease is breast cancer.