While greater concentrations of haptoglobin (10,000 ng/ml) and I-TAC/CXCL11 (10 pg/ml) were significantly associated with moderate increases in the likelihood of pSS diagnosis over RA (haptoglobin: OR = 1.015 and 95% CI [1.002–1,029]; p = 0.0262; I-TAC/CXCL11: OR = 1.344 and 95% CI [1.027–1.76]; p = 0.0314). Here, HP is linked to rheumatoid arthritis.