COL1A2 and rheumatoid arthritis: We assessed the serum biomarkers indicative of bone remodeling—C-terminal propeptides of type I procollagen (PICP) and N-terminal propeptides of type I procollagen (PINP), which are markers of bone formation, and C-terminal crosslinking telopeptides of type I collagen (CTX-I) and N-terminal cross-linking telopeptides of type I collagen (NTX-I), which are markers of bone resorption—in female RA patients treated with TNFαI.