In this report, PsA disease activity stages were graded based on DAS28-CRP grading as defined for its original purpose of evaluating rheumatoid arthritis (< 2.6 remission; ≥ 2.6 to < 3.2: low activity, ≥ 3.2 to 5.1: moderate activity, > 5.1: high activity)42. Here, CRP is linked to rheumatoid arthritis.