6. 一位17歲男性病人因發燒住院,血液檢查顯示紅血球2,350,000/uL,白血球1,050/uL,其中segmented forms 10%,bands 2%,lymphocytes 82%,monocytes 6%,血小板16,400/uL,網狀紅血球1%;使用抗生素後,體溫回復正常。骨髓檢查顯示為再生不良性貧血,下一步最適當的治療為何?
(A) Antithymocyte globulin
(B) Cyclosporine
(C) Antithymocyte globulin及cyclosporine
(D) Anabolic hormone
(E) Allogeneic hematopoietic stem cell transplantation from a HLA-matched sibling donor