MICA and head and neck squamous cell carcinoma: Four previously reported loci, 2p23.1, 5p15.33 (rs1265081, CCHCR1), 6p21.32 (rs3135001, HLA-DQB1) and 6p21.33(rs13211972, MICA) and two novel loci 6p22.1 (rs259919) and 18q22.2 (rs142021700) were associated with SCCHN risk, thus highlighting the importance of HLA loci for oropharyngeal cancer risk.