In these non-obese, non-insulin resistant PCOS women, no difference was found between PCOS and controls for the levels of the following 12 members of the matrix metalloproteinase family: MMP1, MMP2, MMP3, MMP7, MMP8, MMP9, MMP10, MMP12, MMP13, MMP14, MMP16 and MMP17 (Table 2). This evidence concerns the gene MMP13 and polycystic ovary syndrome.