In a multicenter, open-label, phase 2 study published in 2012, women with HER2-positive breast cancer received trastuzumab (8 mg/kg loading dose, followed by 6 mg/kg every 3 weeks) plus docetaxel (75 mg/m2, escalating if tolerated, to 100 mg/m2 every 3 weeks; group A) or pertuzumab (loading dose 840 mg, followed by 420 mg every 3 weeks) and trastuzumab plus docetaxel (group B) or pertuzumab and trastuzumab (group C) or pertuzumab plus docetaxel (group D) [15]. The gene discussed is ERBB2; the disease is breast cancer.