Objective: To investigate potential associations between body mass index (BMI) and head and neck cancer (HNC) risk in an East Asian population.
Methods: We conducted a hospital-based multicenter case-control study in East Asia including 921 cases and 806 controls. We estimated the odds ratios (ORs) and 95% confidence intervals (95% CI) for HNC risks by using logistic regression, adjusting on potential confounders.
Results: Compared to normal BMI at interview (18.5-<25 kg/m2), being underweight (BMI < 18.5 kg/m2) was associated with a higher HNC risk (OR = 2.71, 95% CI 1.40-5.26). Additionally, obesity (BMI > 30 kg/m2) was associated with a lower HNC risk (OR = 0.30, 95% CI 0.16-0.57). Being underweight at age 20 was also associated with an increased risk of HNC. However, being underweight at 5 years or 2 years before interview was not associated with a higher risk of HNC.
Conclusion: We observed an inverse association between BMI and HNC risk, which is consistent with previous studies in other geographic regions. Being underweight at age 20 was also associated with a higher risk of HNC, suggesting that reverse causality was not the main source of the association.
Keywords: BMI; East Asia; Head and neck cancer risk.
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