Overall the incidence rate of NPC in the whole CKB cohort was 8.6 per 100 000 person-years (N = 370), with the rates higher in men than in women (12.8 vs 5.8 per 100 000) and higher at older than younger ages in both sexes (Supplementary Figure S3, available as Supplementary data at IJE online). The gene discussed is CKB; the disease is nasopharyngeal carcinoma.