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Interleukin-2 after autologous bone marrow transplantation as consolidative immunotherapy against minimal residual
1Université Catholique de Louvain, Laboratoire d'Oncologie et d'Hématologie Expérimentales, Bruxelles, Belgique.
Recipients of autologous BMT demonstrate clinically significant immune deficiency, particularly involving the T lymphocytes. While quantitatively the immune system generally returns to normal during the first 3 months, there is a prolonged delay in the recovery of qualitative immune functions. T cell proliferation is impaired immediately after transplantation and slowly recovers over a period of more than 1 year. In addition, a defect has been documented in IL-2 producing cells and may be of major importance in the pathophysiology of this immunodeficiency. However, post-ABMT, PHA-stimulated T cells are TAC+ and are able to respond to exogenous IL-2 in vitro. Very early after ABMT, NK and LAK activities of PBMC normalize but are significantly increased in vitro by IL-2. On this basis, a clinical assessment of rIL-2 administration on the immunological reconstitution of ABMT patients and as consolidation immunotherapy against minimal disease has been initiated in a phase I/II study.
Recipients of autologous BMT demonstrate clinically significant immune deficiency, particularly involving the T lymphocytes. While quantitatively the immune system generally returns to normal during the first 3 months, there is a prolonged delay in the recovery of qualitative immune functions. T cell proliferation is impaired immediately after transplantation and slowly recovers over a period of more than 1 year. In addition, a defect has been documented in IL-2 producing cells and may be of major importance in the pathophysiology of this immunodeficiency. However, post-ABMT, PHA-stimulated T cells are TAC+ and are able to respond to exogenous IL-2 in vitro. Very early after ABMT, NK and LAK activities of PBMC normalize but are significantly increased in vitro by IL-2. On this basis, a clinical assessment of rIL-2 administration on the immunological reconstitution of ABMT patients and as consolidation immunotherapy against minimal disease has been initiated in a phase I/II study.