PDGFC and head and neck squamous cell carcinoma: Other genes that showed potential association with cancer pain in HNSCC patients included PIK3C2G (rs10770367, p value = 1.10 × 10−3), TCRA (rs6572493, p value = 2.84 × 10−3), PDGFC (rs6845322, p value = 4.88 × 10−3), and CD247 (rs2995082, p value = 7.79 × 10-3).