A study on the distribution of HLA alleles including A, B, DR and DQ among Thai patients having a proven anti-rHuEpo associated PRCA, CKD patients waiting for kidney transplant and normal people who donated the stem cells, demonstrated a correlation between the HLA-DRB1*09 and the anti-rHuEpo PRCA cases17. This evidence concerns the gene HLA-DRB1 and pure red-cell aplasia.