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Biomarker analysis was conducted in 13 patients.
Retrospectively explored after prospective enrollment.
Abbreviations: ECOG PS, Eastern Cooperative Oncology Group Performance Status; EGF, epidermal growth factor; EGFR, epidermal growth factor receptor; HB‐EGF, heparin‐binding epidermal growth factor‐like growth factor; IHC, immunohistochemistry; TGF‐α, transforming growth factor alpha.
