Thirty-six patients received treatment with trastuzumab plus pertuzumab for tumors with HER2 mutations (without amplification/overexpression); four of these patients (11%; 95% CI, 3% to 26%) had objective responses...Fourteen of the 36 patients with HER2-mutated tumors had NSCLC (adenocarcinoma, n = 13; adenosquamous, n = 1); in this group, three patients (21%; 95% CI, 5% to 51%) had PR and three had SD > 120 days.