MMP9 and rheumatoid arthritis: In previous case-control studies, we genotyped eight MMP9 and MMP2 single-nucleotide polymorphisms (SNPs; rs3918249, rs2274755, rs3918254, rs243832, rs1053605, rs243849, rs243847, rs7201) that are associated with rheumatoid arthritis [9], glaucoma [17], asthma [6], thoracic aortic dissection [18], steroid-induced osteonecrosis [19], myopia, refractive error, ocular biometric measures [20], psoriasis vulgaris [21], endometriosis [22], obesity [23], and alcohol-induced osteonecrosis of the femoral head [24].