Do you consider Anti-carbamylated protein antibodies (anti-CarP) as having any significance in evaluation of patients if RF and ACPA negative and clinically no active synovitis yet widespread arthralgias and generalized osteoarthritis?

Anti-CarP has been touted as another biomarker for early RA with rates of positivity in ACPA and/or RF-negative patients ranging from 4.5 % in a recent study by Ricchiuti et al., PMID 35885566 to 23.6% in the French ESPOIR cohort. Ricchiuti described anti-CarP tracked the most closely with 14-3-3 et...