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Continuous Fluorescence-Based Endonuclease-Coupled DNA Methylation Assay to Screen for DNA Methyltransferase Inhibitors
Published on: August 5, 2022
Novel targeted therapeutics: inhibitors of MDM2, ALK and PARP
Yuan Yuan1, Yu-Min Liao, Chung-Tsen Hsueh
1Division of Medical Oncology and Hematology, Loma Linda University Medical Center, Loma Linda, CA 92354, USA.
Abstract:
We reviewed preclinical data and clinical development of MDM2 (murine double minute 2), ALK (anaplastic lymphoma kinase) and PARP (poly [ADP-ribose] polymerase) inhibitors. MDM2 binds to p53, and promotes degradation of p53 through ubiquitin-proteasome degradation. JNJ-26854165 and RO5045337 are 2 small-molecule inhibitors of MDM2 in clinical development. ALK is a transmembrane protein and a member of the insulin receptor tyrosine kinases. EML4-ALK fusion gene is identified in approximately 3-13% of non-small cell lung cancer (NSCLC). Early-phase clinical studies with Crizotinib, an ALK inhibitor, in NSCLC harboring EML4-ALK have demonstrated promising activity with high response rate and prolonged progression-free survival. PARPs are a family of nuclear enzymes that regulates the repair of DNA single-strand breaks through the base excision repair pathway. Randomized phase II study has shown adding PARP-1 inhibitor BSI-201 to cytotoxic chemotherapy improves clinical outcome in patients with triple-negative breast cancer. Olaparib, another oral small-molecule PARP inhibitor, demonstrated encouraging single-agent activity in patients with advanced breast or ovarian cancer. There are 5 other PARP inhibitors currently under active clinical investigation.
Insights
This review covers MDM2, ALK, and PARP inhibitors in clinical development. These targeted therapies show promise for various cancers, including lung, breast, and ovarian cancers, with ongoing research for improved patient outcomes.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- MDM2 (murine double minute 2) inhibitors target p53 degradation.
- ALK (anaplastic lymphoma kinase) fusions are implicated in non-small cell lung cancer (NSCLC).
- PARP (poly [ADP-ribose] polymerase) inhibitors are involved in DNA repair pathways.
Purpose of the Study:
- To review preclinical and clinical data for MDM2, ALK, and PARP inhibitors.
- To highlight the therapeutic potential of these targeted agents in various cancers.
- To summarize current clinical development and early findings.
Main Methods:
- Review of preclinical data.
- Analysis of clinical trial results.
- Literature search for MDM2, ALK, and PARP inhibitors.
Main Results:
- MDM2 inhibitors (JNJ-26854165, RO5045337) are in clinical development.
- ALK inhibitor Crizotinib shows activity in NSCLC with EML4-ALK fusion.
- PARP inhibitors (BSI-201, Olaparib) demonstrate efficacy in breast and ovarian cancers.
Conclusions:
- Targeted inhibitors of MDM2, ALK, and PARP represent a promising area in cancer therapy.
- Clinical development is advancing for these agents across multiple cancer types.
- Further investigation is warranted to optimize their use and improve patient outcomes.
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