Etiologies and Treatment Burden in Adult Patients with Pure Red Cell Aplasia: A Single-Center Experience and Review of Literature.

Background: Pure red cell aplasia (PRCA) is less common blood disorder; the causes and the treatments of PRCA are varied.

Methods: We conducted a retrospective study during January 2010-December 2017, to explore the etiologies and to evaluate the response and treatment burden in adult patients with PRCA.

Results: Of 32 PRCA patients, median age was 57 years (18-90 years). Median hemoglobin level and reticulocyte count at the time of diagnosis were 5.6 g/dL (3.3-7.3 g/dL) and 0.3% (0.1-0.7%), respectively. Median time to hematologic recovery was 12 weeks (3-72 weeks), and median number of red blood cell transfusion (RBC) was 20 units (4-100 units). Causes of PRCA were erythropoiesis-stimulating agent (ESA) (47%), parvovirus B19 infection (19%), thymoma (13%), zidovudine (6%), primary autoimmune PRCA (6%), Kaposi's sarcoma (3%), systemic lupus erythematosus (3%), and ABO-mismatched stem cell transplantation (3%). Only 9 out of 24 treated patients achieved hematologic response within 8 weeks of treatment. Intravenous immunoglobulin therapy provided 100% response rate in patients with parvovirus B19-associated PRCA and primary autoimmune PRCA. Low response rate was found in patients receiving immunosuppressants and chemotherapy for the treatment of ESA and thymoma-associated PRCA, respectively.

Conclusions: Treatment outcome of PRCA depended upon the causes and the types of treatment, and the burden of RBC transfusion was very high in patients with ESA and thymoma-associated PRCA.