**I-squared: the variation in Effect Size attributable to heterogeneity. Note: Between-group heterogeneity was not calculated. Significance test(s) of ES = 0.
#Ethnicity, including Asian, European, and others (North American and African);§Cancer type, including breast, colorectal, esophageal, gastric, gynecological, lung, nasopharyngeal, pancreatic, prostat
