Key clinical point: The combination of serum interleukin-6 (IL-6), platelet to lymphocyte ratio (PLR), and nail psoriasis can help screen and predict early stage of psoriatic arthritis (PsA).
Major finding: The proportion of patients with elevated serum IL-6 levels was significantly higher in the PsA vs. plaque psoriasis group ( P < .0167), with the elevations in PLR levels and systemic immune-inflammation index being significantly higher among patients with PsA and early PsA vs. plaque psoriasis ( P < .05 for all). The combination of nail psoriasis ( P = .002), IL-6 ( P < .001), and PLR ( P < .001) as a predictor for early PsA diagnosis showed an area under curve of 0.84 (95% CI, 0.77-0.90).
Study details: Findings are from a case-control study including 109 patients with plaque psoriasis without joint involvement, 47 patients with PsA, and 41 patients with rheumatoid arthritis.
Disclosures: This study did not receive any funding. The authors declared no conflict of interests.
Source: Liu X et al. The combination of IL-6, PLR and nail psoriasis: Screen for the early diagnosis of psoriatic arthritis. Clin Cosmet Investig Dermatol. 2023;16:1703-1713 (Jun 28). Doi: 10.2147/CCID.S413853.