PsA, psoriatic arthritis, OA, osteoarthritis; PASI, psoriasis area and severity index; SJC, Swollen joint count; TJC, Tender joint count; AJC, Active (swollen or tender) joint criteria; DAPSA, Disease activity in PsA; BMI, body mass index; t-DMARD, targeted disease-modifying anti-rheumatic drug; c-DMARD, conventional disease-modifying antirheumatic drug; hsCRP, high-sensitive c-reactive protein; N/A, not applicable. This evidence concerns the gene CRP and psoriatic arthritis.