FAM13A and rheumatoid arthritis: In logistic regression analyses, the same two SNPs, rs35705950 and rs111521887, were also associated with an increased risk of PF in RA [for rs35705950: OR 2.5 (95% CI 1.5, 4.0), adjusted P-value = 0.00016, q-value = 0.0021; for rs111521887: OR 1.9 (95% CI 1.3, 2.8), adjusted P-value = 0.0014, q-value = 0.0092; Table 2b], as was SNP rs2609255 (FAM13A gene locus; OR 1.7 (95% CI 1.1, 2.5), adjusted P-value = 0.013, q-value = 0.055].