DPP4 and thromboangiitis obliterans: Multivariate logistic regression analysis revealed DPP4 (P = 0.002; OR, 1.007; 95% confidence interval [CI], 1.003–1.011) and PRKCG (P = 0.017; OR, 1.008; 95% CI, 1.001–1.014) to be significantly associated with TAO occurrence.