Donor lymphocyte infusion (DLI) is used after both myeloablative and non-myeloablative stem-cell transplantation to treat and prevent relapse, to establish full donor chimerism, and to treat and prevent infections. The major treatment-related complication of DLI is graft-versus-host disease (GVHD). The presentation and treatment of GVHD after DLI is similar to its presentation and treatment after stem-cell transplantation, with some notable exceptions. While GVHD and graft-versus-tumor (GVT) effects are highly correlated after DLI, some patients experience remission without GVHD. Studies to define tumor-specific target antigens and GVT effector cells, as well as strategies of donor T-cell manipulation and optimization of DLI dose and schedule, may ultimately lead to the consistent ability to separate GVHD from GVT activity, improvement in the safety and specificity of DLI, and enhancement of the anti-tumor activity of donor T cells.
Keywordsdonor lymphocyte infusion; immunotherapy; graft-versus-host disease; graft-versus-tumor effect; CD8 + depletion; T-cell inactivation; suicide gene It is well established that the success of allogeneic stem-cell transplantation (SCT) relies in part on the graft-versus-tumor (GVT) effect of donor-derived T cells.[1,2] Donor lymphocyte infusions (DLIs) are frequently used to harness this GVT activity in patients who relapse after SCT and have otherwise limited treatment options. DLI is dramatically effective in inducing sustained remissions and cure in patients with chronic myelogenous leukemia (CML) in chronic phase, but is less successful in inducing initial and sustained remissions in patients with advanced-phase CML or acute leukemia. [3][4][5][6][7] Optimizing the effectiveness of DLI for non-CML disorders is the subject of numerous trials. [8,9] The broadening applications of allogeneic SCT and expansion of non-conventional conditioning regimens have resulted in the increased use of DLI for several other indications (Table 1). In addition to the treatment of relapsed disease after SCT, DLI is being used as prophylaxis after SCT for patients with a high risk of relapse due either to advanced disease stage or in conjunction with T-cell-depleted grafts. [10][11][12] In addition, DLI has been used successfully to treat graft failure, post-transplant lymphoproliferative disorder (PTLD), viral infections, and as a method to facilitate immune reconstitution after allogeneic SCT. [13][14][15][16] *Corresponding author. Tel.: +1-215-662-2867; Fax : +1-215-662-4064. E-mail address: david.porter@uphs.upenn.edu. Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply ...