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Immunological Effects of Interleukin 12 Administered by Bolus Intravenous Injection to Patients with Cancer¹

Division of Hematologic Malignancies, Dana-Farber Cancer Institute, Boston, Massachusetts 02115 [M. J. R., C. C., J. R.]; Tupper Research Institute and Division of Hematology/Oncology, Tufts-New England Medical Center, Boston, Massachusetts 02111 [M. B. A.]; Division of Hematology/Oncology, Indiana University Medical Center, Indianapolis, Indiana 46202 [M. S. G.]; Division of Surgical Oncology, Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania 15261 [M. T. L.]; and Genetics Institute, Cambridge, Massachusetts 02140 [M. L. S.]

The immunological effects of recombinant human interleukin 12 (rhIL-12) administration were examined during the conduct of a Phase I clinical trial. Forty patients with advanced cancer received bolus i.v. injections of rhIL-12 in doses ranging between 3 and 1000 ng/kg. Dose-dependent increases in serum IFN- levels were seen during rhIL-12 therapy. Significant lymphopenia was observed 24 h after single i.v. injections of rhIL-12 at each dose level. The degree of lymphopenia was dose dependent, and a plateau effect was seen with rhIL-12 doses of 100 ng/kg and higher. Lymphocyte counts reached nadir levels at approximately 10 h after rhIL-12 injection and returned to baseline within 14 days postinjection. Rebound lymphocytosis, as seen after interleukin 2 therapy, was not observed after recovery from rhIL-12-induced lymphopenia. rhIL-12-induced lymphopenia involved all major lymphocyte subsets, although natural killer (NK) cell numbers were the most profoundly affected, and CD4 T-cell numbers were the least affected. CD2, LFA-1, and CD56 were transiently up-regulated on the surface of NK cells exposed to rhIL-12 in vivo. Peripheral blood mononuclear cells obtained from cancer patients before rhIL-12 therapy exhibited defective NK cell cytotoxicity and T-cell-proliferative responses. Peripheral blood mononuclear cells obtained after lymphocyte recovery following the administration of a single 500 ng/kg dose of rhIL-12 displayed augmented NK cell cytolytic activity in four of four patients tested and enhanced T-cell proliferation in three of four patients tested. These studies confirm that doses of rhIL-12 resulting in significant immunological activity can be administered with acceptable toxicity to cancer patients. Furthermore, rhIL-12 therapy can reverse defects in NK cell and T-cell function that are associated with advanced cancer in humans.

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