Possible new biomarker in early RA? RA patients with high level of measurable fibrogenesis (PRO-C3 serum levels) less likely to respond to TCZ, as compared to patients with low level of fibrogenesis. Abs 1986 #ACR22 @RheumNow https://t.co/xnyoV2xbWq https://t.co/Vka8UZsrar