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- W2520492051 abstract "Proceedings: AACR 106th Annual Meeting 2015; April 18-22, 2015; Philadelphia, PABack ground: Metastatic melanoma is an aggressive tumor of the epidermal melanocytes with high mortality rates in patients. The anti- melanoma immune response has been extensively studied while immune based treatment strategies are showing promising activity in melanoma patients. A number of immune characteristics are evaluated as predictive and prognostic biomarker.Methods: With approval from Institution's regulatory board, we analyzed T cells from peripheral blood of 12 metastatic melanoma patients for baseline frequency of T cells reacting against melanoma related Mart-1 27-35 epitope. We expanded CD 8+ T lymphocytes by exposing them to the Mart-127-35 epitope pulsed on autologous mononuclear cell derived antigen presenting cells ex vivo. Using magnetic bead separation techniques, we also isolated from the peripheral blood CD4+CD25+ (naturally occurring Treg) and CD4+CD25- cells and analyzed in vitro proliferation of CD4+CD25- T cells in response to anti CD3 antibody and PHA and analyzed the effects of CD4+CD25+ cells on their proliferation. Finally, we induced CD4+ T cells into Th1 or Th2 type responses and analyzed their function in vitro.Results: There was variable degrees of CD8+effector T lymphocytes responses to the antigens in in vitro cultures from all the patients studied and their cytokine profile noted. The percentage of nTreg activity in the PBL averaged about 5% that demonstrated suppression of the CD4+CD25- T cells proliferation in response to anti CD3 antibody in about 50% of patients, but lacked suppression activity in about 50% of the patients. It was possible to generate Th1 type cells from all the patients but generation of the Th2 type cells was limited to 50%. Favorable immune characteristics were observed in majority of the patients who are responding to the treatment.Conclusion: Our findings suggest that in vitro functional T cell immune characteristics could be examined in patients diagnosed with metastatic melanoma. Examination of these characteristics in larger number of patients diagnosed with melanoma might provide predictive marker for immune intervention.Citation Format: Upendra P. Hegde, Sidharth S. Jha, Nitya G. Chakraborty. In vitro analysis of T cells effector vs regulatory function in patients with metastatic melanoma and its correlation to patient outcome. [abstract]. In: Proceedings of the 106th Annual Meeting of the American Association for Cancer Research; 2015 Apr 18-22; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Res 2015;75(15 Suppl):Abstract nr 1305. doi:10.1158/1538-7445.AM2015-1305" @default.
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- W2520492051 date "2015-08-01" @default.
- W2520492051 modified "2023-09-26" @default.
- W2520492051 title "Abstract 1305:In vitroanalysis of T cells effector vs regulatory function in patients with metastatic melanoma and its correlation to patient outcome" @default.
- W2520492051 doi "https://doi.org/10.1158/1538-7445.am2015-1305" @default.
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