Among these studies, 8 studies with 2 polymorphisms [11, 12, 14, 15, 18, 19] (5 studies for MMP1 rs1799750, 3 studies for MMP3 rs34093618) involving 1019 ovarian cancer cases and 1609 controls could be quantitatively synthesized for meta-analysis. Here, MMP1 is linked to ovarian cancer.