“…4 Various causative factors proposed include total body irradiation, acute GVHD, active cytomegalovirus or fungal Correspondence: T Natazuka, Shinseikai-Santoh Clinic, Ro336-85 Nagahisa, Nagahisa-cho, Oda-city, Shimane 694, Japan Received 4 August 1997; accepted 20 November 1997 infection, and cyclosporin A (CsA) toxicity, although no single specific factor has been identified. [6][7][8][9][10][11][12][13][14][15] We have frequently observed BMT-TM in unrelated donor patients. 16 In the present study, we investigated coagulation abnormalities and BMT-TM by comparison of patients receiving related and unrelated donor BMT.…”