Acute graft-versus-host disease in a recipient of a twin blood cell transplant

There are reports of acute graft-versus-host disease (GVHD) after autologous and twin bone marrow transplants but they are controversial because of the difficulty of accurate diagnosis. We report a subject with Philadelphia chromosome-positive CML who received two syngeneic transplants of blood cells. In the first transplant of 2.6 x 10(8) mononuclear cells/kg, no pretransplant conditioning was given; in the second transplant of 4.9 x 10(8) mononuclear cells/kg, pretransplant conditioning therapy consisted of chemotherapy and TBI. Although no symptoms were seen after the first transplant, the second was followed by fever, diarrhea, rash and liver function test abnormalities coincident with engraftment. Symptoms resolved spontaneously. The patient was not on any medication and had not received any transfusions, Our observations suggest either that acute GVHD in a twin transplant is a direct consequence of conditioning or that pretransplant conditioning is a prerequisite for developing features resembling acute GVHD.