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Cancer immunotherapy using checkpoint blockade.

Antoni Ribas1, Jedd D Wolchok2,3

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Immune checkpoint inhibitors like CTLA-4 and PD-1 therapies offer durable cancer responses. However, acquired resistance can emerge, potentially through antigen presentation and interferon-γ pathway alterations, necessitating novel combination strategies.

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Area of Science:

  • Immunology and Oncology
  • Cancer Immunotherapy

Background:

  • Immune checkpoint inhibitors targeting cytotoxic T lymphocyte-associated protein 4 (CTLA-4) and programmed cell death 1 (PD-1) pathways have revolutionized cancer treatment.
  • These therapies unleash pre-existing antitumor T cells, leading to durable responses in many patients across various cancers.

Purpose of the Study:

  • To review the efficacy of immune checkpoint blockade in cancer treatment.
  • To explore mechanisms of acquired resistance to these therapies.
  • To discuss potential new combinatorial strategies to overcome resistance.

Main Methods:

  • Review of existing clinical data and preclinical research on immune checkpoint inhibitors.
  • Analysis of proposed mechanisms underlying acquired resistance.
  • Evaluation of emerging combination therapy approaches.

Main Results:

  • Immune checkpoint blockade achieves unprecedented long-lasting tumor responses in a significant patient population.
  • Approximately one-third of patients eventually relapse, indicating the development of acquired resistance.
  • Emerging evidence suggests resistance mechanisms involve alterations in antigen presentation and interferon-γ signaling.

Conclusions:

  • While effective, immune checkpoint inhibitors face challenges with acquired resistance.
  • Understanding resistance pathways is crucial for improving patient outcomes.
  • Next-generation combinatorial therapies hold promise for overcoming these resistance mechanisms and enhancing antitumor immunity.