Gene mutation profile in patients with acquired pure red cell aplasia.

Acquired pure red cell aplasia (PRCA) is a disorder characterized by normocytic anemia associated with reticulocytopenia and an absence of erythroblasts. The gene mutation profile in acquired PRCA is not defined yet. In this study, we aimed to identify the gene mutation spectrum of patients with acquired PRCA and the correlation between gene mutations and response to immunosuppressive therapy (IST). Thirty newly diagnosed acquired PRCA patients were enrolled in this study, and then whole-exome sequencing were performed among these patients and a panel with 93 candidate genes which associated with other bone marrow failure for the following analysis. Subsequently patients were treated with IST for at least 2 years. When treated with IST, there were thirteen complete response, ten partial response (ORR 76.7%), and seven no response at a medium of 8 (6-10) months. Totally twenty-three mutations in fifteen genes were detected in sixteen patients (53%). The mutated genes were associated with transcription, signal transduction, and epigenetic regulation pathways. The most frequent transitions in the point mutations were C > T. Age, gender, hemoglobin level at diagnosis, and gene mutation or not did not influence the response to IST. However, although patients with BCOR or BCORL1 mutations had a similar response to IST compared with those without mutation (P = 0.235), they had a better response than those with other gene mutations (P = 0.0193). In conclusion, patients with acquired PRCA may have clonal gene mutations. The patients with BCOR and BCORL1 mutations may suggest a better response to IST compared with those with other mutations.