CRP and rheumatoid arthritis: Several markers are known to be related to disease progression in RA (C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), anti-cyclic citrullinated peptide (anti-CCP) antibodies, rheumatoid factor, and osteoprotegrin-receptor activator of nuclear factor (NF)- κB ligand) [1-3], but better clinical response markers are needed to assist rheumatologists in selecting treatments most likely to benefit any particular patient.