Abstract
The influence of the number of apheresis-stimulation-infusion(s) cycles, and the time in culture before the infusion (one vs. two weeks), on the generation of tumor antigen-specific cytotoxic T-lymphocytes (CTL) was investigated in a phase I/II clinical adoptive immunotherapy trial. Two previously treated metastatic breast cancer patients with no evidence of disease, in complete remission (CR), were enrolled. Each apheretic peripheral blood mononuclear cell (PBMC) sample was stimulated twice with MUC-1 before infusion back into the patients. Killer T-cells responses against MUC-1-expressing MCF-7 (CTL), nonspecific natural killer (NK) and lymphokine-activated killer (LAK) target cell lines, as well as, cytokine production were measured before each infusion. Patients received 2 infusions per month for 4 months. There were no tumor recurrences or toxicity. CTL, NK and LAK cells, type 1 cytokine, gamma-interferon (G-INF), and CD4(+) and CD8(+) memory T-lymphocytes were initially generated, produced or induced, respectively, and then declined. The CTL, NK and LAK cells were only induced at the first infusion of the first month. Thus, maintaining PBMC in culture longer than the first infusion was of no benefit with regards to retain...Continue Reading
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