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M. Clés, :. Kras, . Utr, . Cetuximab, . Métastatique et al., Introduction : KRAS LCS6 variant is a single nucleotid polymorphism in the 3'UTR of KRAS, (a Let7 microRNA binding site) and could induced an EGFR oncogenic dependance by loss of KRAS downregulation. It could thus involve a greater sensibily to EGFR-targeted therapy, The main objective is to evaluate the association between KRAS LCS6 variant and response to Cetuximab (Cx) in metastatic Head and Neck carcinoma