ERCC2 and head and neck squamous cell carcinoma: The maximum changes from baseline in the sum of reference diameters of target lesions in HNSCC patients with XPD c.934G>A SNP genotypes are presented in Figure 1A and 1B; patients with variant genotype had more median change than those with wild-type or heterozygous genotypes of XPD c.934G>A SNP (-63.0% versus -52.5%) of presenting response to chemoradiotherapy.