Funnel plot for the detection of the publication bias in the meta-analysis of the association between GSTM1/GSTT1 polymorphisms and RCC risk.

<p>(A) Funnel plot for the detection of bias in the meta-analysis of the association between GSTM1 null genotype and RCC risk using the fixed-effects model. (B) Funnel plot for the detection of bias in the meta-analysis of the association between GSTT1 null genotype and RCC risk using the random-effects model. Each point represents an individual study for the indicated association. LogOR, natural logarithm of OR. Perpendicular line denotes the mean effect size.