Embodiments of the present invention relate to compositions and methods for treatment of subjects in need of or having a bone marrow transplant. Certain embodiments describe compositions and methods for treatment of conditions associated with bone marrow transplantations in a subject, for example, Graft versus Host Disease (GvHD) or bone marrow transplantation rejection. Some embodiments concern early or immediate bone marrow transplantation rejection. Certain embodiments relate to compositions and uses of alpha1-antitrypsin (α1-antitrypsin, AAT) and carboxyterminal peptide derivatives thereof and/or compositions and uses of serine protease inhibitors, immunomodulators or anti-inflammatory agent activity similar to that of AAT.
