OR13G1 and head and neck squamous cell carcinoma: In conclusion, chromosome 1:44q may serve as a susceptibility locus for pain prior to treatment in HNSCC patients, with three variants, rs3862188, rs880143 and rs7526880, mapped to the RP11-634B7.4 gene, a novel antisense gene to three olfactory receptor genes: OR13G1, OR6F1 and OR14A210, 11.