A case-control study of risk factors of nasopharyngeal carcinoma

Risk factors and nasopharyngeal carcinoma (NPC) in residents of Guangzhou city were investigated in a case-control study: 104 cases were compared with an equal number of age, sex, and neighborhood-matched controls. The results of multiple conditional regression of logistic model showed that plum vegetable (adjusted OR=1.81, 95% CI 1.01–3.33), preserved prune (adjusted OR=2.95, 95% CI 1.04–8.41), no separate kitchen (if >35 years, adjusted OR=1.98, 95% CI 1.24–3.75), kitchen range without chimney (if >10 years, adjusted OR=2.72, 95% CI 1.56–4.73) and hereditary factor (adjusted OR=8.27, 95% CI 1.94–35.54) were significantly associated with an increased risk of NPC. Grape (adjusted OR=0.31, 95% CI 0.17–0.58) may be a protective factor.