“…The sixth was receiving MMF, cyclosporine, and prednisone, but had also previously undergone total lymphoid irradiation and plasmapheresis for severe early vascular rejection. Whether or not the combination of tacrolimus and MMF represents a greater risk for hypogammaglobulinemia and for infection than other regimens, such as MMF in combination with cyclosporine, is the subject of an ongoing prospective study in heart transplant recipients ( 23).…”