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Immune T cells can transfer and boost anti-breast cancer immunity.
Oncoimmunology 2018
This proof-of-concept study investigates the immune effects in metastatic breast cancer (MBC) patients after "vaccination" with activated T cells (ATC) armed with anti-CD3 x anti-HER2 bispecific antibody (HER2 BATs) followed by immune consolidation with immune ATC "boost" after high dose chemotherapy (HDC) and autologous stem cell transplant (SCT). Approximately 2 weeks after completion of vaccination portion of the study, immune T cells were obtained by leukopheresis, activated and expanded ex vivo and re-infused after HDC and SCT to test the hypothesis that transfer of immune unarmed ATC would accelerate reconstitution of anti-tumor activity after SCT. Eight metastatic breast cancer (MBC) patients received 8 infusions of HER2 BATs, low dose IL-2, and GM-CSF in the first part of the protocol to induce adaptive cellular and humoral responses. In the "boost" portion of the protocol, 6 of 8 patients received multiple infusions of unarmed ATC post SCT. There were no dose-limiting toxicities or delays in engraftment. Four of 6 patients tested for the immune correlative studies exhibited increases in anti-breast cancer (BrCa) cytotoxicity, antigen specific IFN-γ Elispots, anti-BrCa antibodies and increased IL-12 and Th1 serum cytokine levels after HER2 BATs infusions. Anti-BrCa tumor responses were seen as early as 2 weeks after SCT and persisted up to 2 years post-SCT. One out of 6 patients' rapidly progressed and showed poor immune responses and high Th2 cytokine levels. There was a significant correlation (p < 0.002) between time to progression (TTP) and anti-BrCa cytotoxicity by immune T cells. This is the first study to show that adoptive transfer of immune T cells after SCT accelerates reconstitution of anti-BrCa specific immunity and correlates with delay TTP.
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