After six months of immunosuppressant therapy (corticosteroids + cyclosporine) the patients were stable with Hb > 9.0 g/dl.<h4>Conclusion</h4>PRCA is a rare condition among patients on dialysis treated with rhEPO and should be considered as a possible cause of refractory anemia. This evidence concerns the gene GSTM1 and anemia (phenotype).