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PARP inhibitors: enhancing efficacy through rational combinations

Deepak Bhamidipati1, Jaime I Haro-Silerio2, Timothy A Yap3,4

  • 1Department of Cancer Medicine Fellowship Program, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.

British Journal of Cancer
|July 10, 2023
PubMed

Insights

Poly (ADP-ribose) polymerase inhibitors (PARPi) show promise in treating homologous repair-deficient tumors. This review explores PARPi resistance mechanisms and combination strategies to improve cancer therapy efficacy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Therapeutics

Background:

  • Poly (ADP-ribose) polymerase inhibitors (PARPi) are effective against homologous repair (HR) deficient tumors, like those with BRCA1/BRCA2 mutations.
  • Tumor resistance to PARPi is a significant clinical challenge, limiting long-term treatment success.

Purpose of the Study:

  • To review mechanisms of PARPi resistance in cancer.
  • To explore rational combination strategies involving PARPi to overcome resistance and enhance treatment efficacy.

Main Methods:

  • Literature review of preclinical and clinical studies on PARPi resistance.
  • Analysis of current and emerging PARPi combination therapies, including chemotherapy, immunotherapy, and targeted agents.

Main Results:

  • PARPi resistance develops through diverse mechanisms.
  • Combinations of PARPi with chemotherapy showed efficacy but were limited by toxicity.
  • Newer combinations with immunotherapy and targeted therapies are under investigation with promising preclinical data.

Conclusions:

  • PARPi combination strategies hold potential for synergistic activity and overcoming innate resistance.
  • Careful selection of combination partners is crucial to balance efficacy and toxicity.
  • Further clinical evaluation of novel PARPi combinations is warranted to improve outcomes for HR-deficient tumors.

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