No associations of MLH1 rs1800734, MSH2 rs2303426, MSH3 rs26279, EXO1 rs1047840, EXO1 rs9350 SNPs, and EXO1 haplotypes were seen in survival analyses of HNSCC patients (Supplementary Table 3). This evidence concerns the gene MSH3 and head and neck squamous cell carcinoma.