Figure 4From: Complete response in gallbladder cancer to erlotinib plus gemcitabine does not require mutation of the epidermal growth factor receptor gene: a case report FISH testing for EGFR amplification. Fluorescence in-situ hybridization (FISH) testing of the tumor sample using an EGFR-CEP dual color DNA probe (Vysis) demonstrating lack of EGFR gene amplification.Back to article page