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Epidermal growth factor receptor mutation analysis by Sanger sequencing. A: Epidermal growth factor receptor wild type codon 862 (L862) in inguinal lymph node metastasis before starting crizotinib treatment B: Epidermal growth factor receptor mutation in codon 862 (c.2585 T > G; p.L862R) in newly appeared inguinal lymph nodal metastasis after 8 months of crizotinib treatment.
