Fig. 3From: Safety and efficacy of afatinib as add-on to standard therapy of gemcitabine/cisplatin in chemotherapy-naive patients with advanced biliary tract cancer: an open-label, phase I trial with an extensive biomarker programImmunohistochemical staining, a) negative control, positive staining of b) EGFR (3+), c) HER2neu (1+), d) HER3 (2+) and e) HER4 (only sporadic)Back to article page