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Supplementary Figure S1 from A Phase I/II Trial of HER2 Vaccine–Primed Autologous T-Cell Infusions in Patients with Treatment Refractory HER2–Overexpressing Breast Cancer

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posted on 2023-09-01, 08:22 authored by Mary L. Disis, Yushe Dang, Andrew L. Coveler, Jennifer S. Childs, Doreen M. Higgins, Ying Liu, Jing Zhou, Sean Mackay, Lupe G. Salazar

Flow chart of participants.

Funding

National Cancer Institute (NCI)

United States Department of Health and Human Services

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Gateway for Cancer Research (GCR)

Institute of Translational Health Sciences (ITHS)

Susan G. Komen (SGK)

American Cancer Society (ACS)

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ARTICLE ABSTRACT

High levels of type I T cells are needed for tumor eradication. We evaluated whether the HER2-specific vaccine–primed T cells are readily expanded ex vivo to achieve levels needed for therapeutic infusion. Phase I/II nonrandomized trial of escalating doses of ex vivo–expanded HER2-specific T cells after in vivo priming with a multiple peptide–based HER2 intracellular domain (ICD) vaccine. Vaccines were given weekly for a total of three immunizations. Two weeks after the third vaccine, patients underwent leukapheresis for T-cell expansion, then received three escalating cell doses over 7- to 10-day intervals. Booster vaccines were administered after the T-cell infusions. The primary objective was safety. The secondary objectives included extent and persistence of HER2-specific T cells, development of epitope spreading, and clinical response. Patients received a CT scan prior to enrollment and 1 month after the last T-cell infusion. Nineteen patients received T-cell infusions. Treatment was well tolerated. One month after the last T-cell infusion, 82% of patients had significantly augmented T cells to at least one of the immunizing epitopes and 81% of patients demonstrated enhanced intramolecular epitope spreading compared with baseline (P < 0.05). There were no complete responses, one partial response (6%), and eight patients with stable disease (47%), for a disease control rate of 53%. The median survival for those with progressive disease was 20.5 months and for responders (PR+SD) was 45.0 months. Adoptive transfer of HER2 vaccine–primed T cells was feasible, was associated with minimal toxicity, and resulted in an increased overall survival in responding patients.See related commentary by Crosby et al., p. 3256

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