 - Patients with current stage III or IV GVHD unresponsive to therapy or requiring therapy with anti-CD3 mAb, prednisone 0.5 mgkgday or corticosteroid equivalent, or other treatments resulting in the ablation or inactivation of T cells such as other anti-T cell monoclonal antibodies; although the concurrent use of cyclosporine, FK506, or MMF is not strictly an exclusion criteria, attempts should be made to discontinue it if possible 