Rheumatoid arthritis and pure red cell aplasia

Area of Science:

• Rheumatology
• Hematology
• Immunology

Background:

• Rheumatoid arthritis (RA) is a chronic autoimmune disease.
• Extra-articular manifestations of RA are common.
• Pure red cell aplasia (PRCA) is a rare anemia.

Observation:

• Three patients with severe, long-standing RA developed PRCA.
• PRCA did not resolve after medication withdrawal.
• Two patients achieved remission only after cytotoxic immunosuppressive therapy.

Findings:

• An IgG inhibitor of erythroid progenitor cells was identified in one patient's serum.
• This inhibitor persisted post-treatment, suggesting a potential autoimmune mechanism.
• Chronic PRCA may be an underrecognized extra-articular manifestation of RA.

Implications:

• Consider PRCA in RA patients with unexplained severe anemia.
• Immunosuppressive therapy may be necessary for RA-associated PRCA.
• Further research into the autoimmune link between RA and PRCA is warranted.