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Area of Science:

  • Immunology
  • Oncology
  • Cancer Research

Background:

  • Checkpoint blockade therapy has shown promise in cancer treatment by reactivating anti-tumor immune responses.
  • However, clinical activity is limited to a fraction of patients, necessitating combination strategies.
  • Understanding the functional roles of immune checkpoints and their molecular determinants is crucial.

Purpose of the Study:

  • To review the functional roles of immune checkpoints.
  • To discuss molecular determinants of checkpoint blockade clinical activity.
  • To propose strategies for improving immunotherapy efficacy.

Main Methods:

  • Literature review of immune checkpoint functions.
  • Analysis of molecular determinants influencing checkpoint blockade response.
  • Discussion of factors affecting tumor immunogenicity and burden.

Main Results:

  • Tumors with limited T cell infiltration and significant "self"-difference generally respond to checkpoint blockade.
  • Reducing tumor burden and increasing tumor immunogenicity are proposed as key factors for enhancing immunotherapy.
  • Criteria for selecting immunotherapy combination partners and the role of activity biomarkers are outlined.

Conclusions:

  • Checkpoint blockade efficacy can be improved by strategic combination therapies.
  • Optimizing tumor immunogenicity and reducing tumor burden are critical for enhancing treatment responses.
  • Biomarker-guided treatment selection is essential for timely optimization of cancer immunotherapy.