Forest plot (random effects model) describing the association of the TGFBR1*6A polymorphism with risk of cancer.

<p>The TGFBR1*6A polymorphism was associated with increased risk of cancer in additive model. Each study is shown by the point estimate of the OR (the size of the square is proportional to the weight of each study) and 95% CI for the OR (extending lines).