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Inhibitors of the PD-1 Pathway in Tumor Therapy

Martin W LaFleur1,2, Yuki Muroyama3,4, Charles G Drake5,6

  • 1Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115.

Journal of Immunology (Baltimore, Md. : 1950)
|January 10, 2018
PubMed

Insights

The programmed death 1 (PD-1) pathway inhibits immune responses, including against tumors. Blocking this pathway is a successful cancer immunotherapy, but challenges remain in patient response and adverse events.

Area of Science:

  • Immunology
  • Oncology
  • Pharmacology

Background:

  • The programmed death 1 (PD-1) pathway acts as a crucial brake on immune responses, protecting tissues from damage but also hindering antitumor immunity.
  • PD-1 pathway blockade has revolutionized cancer immunotherapy, demonstrating durable responses across various cancer types.

Purpose of the Study:

  • To review the functions of the PD-1 pathway in cancer immunotherapy.
  • To discuss current challenges and future opportunities in PD-1-based cancer therapy.

Main Methods:

  • This is a review article, synthesizing existing research on the PD-1 pathway and its clinical applications.
  • Key areas explored include mechanisms of response and resistance, biomarker identification, adverse event management, and combination therapy development.

Main Results:

  • PD-1 blockade shows significant efficacy in treating a wide range of cancers.
  • However, a substantial proportion of patients do not respond to PD-1 monotherapy, and adverse events can occur.

Conclusions:

  • Further research is needed to overcome resistance mechanisms and improve patient outcomes in PD-1 immunotherapy.
  • Developing predictive biomarkers, managing adverse events, and exploring novel combination therapies are critical for advancing PD-1 cancer immunotherapy.

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