ARG1 and systemic sclerosis: The AUC of T311354 and ARG1 for discriminating between SSc and RA were 0.667 (95% CI, 0.5030.711; P = 0.002; sensitivity = 35.0%; specificity = 95.0%), 0.738 (95% CI, 0.503-0.711; P < 0.001; sensitivity = 71.7%; specificity = 76.7%), respectively.