Association of Interleukin-18 Gene Promoter −607 C>A and −137G>C Polymorphisms with Cancer Risk: A Meta-Analysis of 26 Studies
Figure 4
Funnel plot analysis to detect publication bias for −607 C>A.
A: funnel plot of all 23 eligible studies on −607 C>A, Egger’s test p = 0.009. B: funnel plot of 22 studies on −607 C>A (Qi’s study was excluded), Egger’s test p = 0.103. The circles represent the weight of individual study.