HLA-DRB1 and pure red-cell aplasia: Here, our study was carried out in a larger cohort size (157 cases, not including 22 cases in the previous study4), with the highest resolution of the HLA genotyping platform, confirming the risk of anti-rHuEPO-induced PRCA in patients with HLA-DRB1*09 and, more specifically, HLA-DRB1*09:01:02:01.