Chemotherapy enhances cancer vaccine efficacy and expands stem-like TCF1(+)CD8(+) T cells.

Chemotherapy with carboplatin plus paclitaxel or cyclophosphamide enhances vaccine efficacy by expanding stem-like TCF1(+)CD8(+) T cells in cancer models and patients.

• Why it matters: Understanding how chemotherapy can synergize with cancer vaccines is crucial for improving immunotherapy strategies, as current combinations lack clear mechanistic insights and consistent efficacy.
• What they did: Researchers tested heterologous prime-boost viral vector vaccines combined with chemotherapy regimens, observing improved antigen-specific CD8+ T cell responses and TCF1+ T cell expansion, with effects confirmed in patient samples.
• The result: The study reveals a TCF1-dependent mechanism for chemotherapy’s immunological adjuvant effect, and combining PD-1 blockade with vaccines and chemotherapy further enhances tumor control and survival, supporting clinical evaluation of this approach.