Background: Whole-cell-based vaccines modified with Hyper-IL-6 (H6) and Hyper-IL-11 (H11) have demonstrated high activity in murine melanoma and renal cancer models.
Materials and methods: H6 and H11 cDNA was transduced into TRAMP cells (TRAMP-H6 and TRAMP-H11). An orthotopic TRAMP model was employed. The efficacy of TRAMP-H6 and TRAMP-H11 in combination with docetaxel was evaluated. Immune cells infiltrating tumors were assessed.
Results: Immunization with TRAMP-H6 and TRAMP-H11 vaccines extended OS of mice. Addition of docetaxel to TRAMP-H6 and TRAMP-H11 vaccines further extended OS of the animals. Vaccination with TRAMP-H6 alone and TRAMP-H11 combined with docetaxel augmented tumor infiltration by activated CD8(+) and CD4(+) T-cells and attracted higher number of activated, mature DCs infiltrating tumors. Addition of docetaxel to TRAMP-H6, TRAMP-H11, TRAMP-Adv700 vaccines enhanced the infiltration of the tumor by NK cells.
Conclusion: Addition of docetaxel to modified TRAMP vaccines improved clinical benefit of treated mice and enhanced anti-tumor immune response.
Keywords: Cancer vaccine; docetaxel; immunotherapy; murine model; prostate cancer.
Copyright© 2015 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved.