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Diagnostic value of anti-carbamylated protein combined with Anti-RA33 antibodies in seronegative rheumatoid arthritis: a retrospective cohort study

Seronegative rheumatoid arthritis (SNRA), defined by the absence of rheumatoid factor (RF) and anti-citrullinated protein antibodies (ACPA), poses a persistent diagnostic challenge. Anti-carbamylated protein antibodies (Anti-CarP-IgG) and anti-RA33 antibodies targeting heterogene...