TNF and pelvic inflammatory disease: The pooled analysis of the present meta-analysis showed that TNF-α (−308 G > A), IL-10 (−1082 A > G), IL-10 (−819 C > T), and IL-10 (−592 A > C) polymorphisms were not associated with PID risk, whereas TNF-α (−308 G > A) polymorphism was associated with a significant elevated risk of PID in patients of Asian ethnicity.