Results: Ten studies were included in this meta-analysis. On average,
GERD was significantly higher in the tumor tissue of the study group compared with normal tissue of the control group
(OR = 2.17, 95% CI = 1.50, 3.14; random effects analysis). The pooled ORs for laryngeal carcinoma were 2.21 (95%
CI = 1.53–3.19; I2 = 97, random effects model) and 3.76 (95% CI = 0.21–67.48; I2 = 94, random effects model) for pharyngeal
carcinoma.