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Combination of suicide gene therapy with erlotinib does not improve therapeutic efficacy. (A) Kaplan–Meier survival analysis does not show a significant difference between double treatment and single treatment arms. (B) Immunohistochemical stainings with antibodies against pEGFR 1068. Scale bar: 50 μm. (C) Quantification showing percentage of pEGFR 1068+ area fraction. (D, E) Immunohistochemical stainings with antibodies against EGFR and quantification of EGFR+ area fraction.
