GSK3B and oral mucositis: Yu et al. (2016) detected that CTNNB1 rs1880481 and rs3864004, and GSK3β rs3755557 were significantly associated with poorer efficacy of radiotherapy in NPC patients, while GSK3β rs375557 and APC rs454886 were correlated with acute grade 3–4 radiation‐induced dermatitis and oral mucositis, respectively.