ALT, alanine aminotransferase; AST, aspartate aminotransferase; CRP, C-reactive protein; DAS28, disease activity score 28; ESR, erythrocyte sedimentation rate; ITGB2, integrin subunit β2; KL, Kellgren–Lawrence; OA, osteoarthritis; RA, rheumatoid arthritis; RF, rheumatoid factor; TLC, total leukocyte count. Here, GPT is linked to rheumatoid arthritis.