PD-1/PD-L1 immune checkpoint blockade in breast cancer: research insights and sensitization strategies

Nov 29, 2024Molecular cancer

Blocking PD-1/PD-L1 Immune Checkpoints in Breast Cancer: Research Findings and Ways to Improve Response

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Abstract

The effectiveness of immunotherapy may depend on tumor-intrinsic factors and cell interactions within the tumor microenvironment.

  • Combining PD-1/PD-L1 immune checkpoint blockade with chemotherapy has shown promising efficacy in early and metastatic triple-negative breast cancer.
  • Only a subset of patients experiences durable responses to this treatment.
  • Identifying responders is critical for optimizing immune drug selection.
  • Key findings from clinical trials indicate that the regulation of PD-L1 expression is influenced by various mechanisms.
  • Recent advances suggest that ' quantity, type, and spatial arrangement could serve as promising biomarkers for therapy.
  • Strategies to enhance the effectiveness of immune checkpoint blockers are being explored to support personalized treatment approaches.

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Key numbers

64.8%
Pathologic Complete Remission Rate Increase
KEYNOTE-522 trial results for early-stage TNBC patients.
15 to 60%
Response Rate Range
Response rates for ICBs in breast cancer.
≥ 5%
TIL Level Predictive Threshold
Threshold identified in a randomized trial for TIL levels.

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