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Updated: Feb 6, 2026
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A Method for Screening and Validation of Resistant Mutations Against Kinase Inhibitors
Published on: December 7, 2014
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The BTK Inhibitor ARQ 531 Targets Ibrutinib-Resistant CLL and Richter Transformation
Sean D Reiff1,2, Rose Mantel1, Lisa L Smith1
1Department of Internal Medicine, Division of Hematology, Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio.
Cancer Discovery
|August 11, 2018
Summary
A new drug, ARQ 531, shows promise in treating chronic lymphocytic leukemia (CLL) by reversibly inhibiting Bruton tyrosine kinase (BTK) and other related kinases, outperforming ibrutinib in preclinical models.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- Bruton tyrosine kinase (BTK) inhibitors like ibrutinib have improved outcomes in hematologic malignancies.
- Acquired resistance to BTK inhibitors, particularly mutations in BTK and PLCγ2, remains a clinical challenge.
Purpose of the Study:
- To investigate ARQ 531, a reversible BTK inhibitor with additional activity against Src family kinases and ERK-related kinases.
- To evaluate the efficacy of ARQ 531 in preclinical models of chronic lymphocytic leukemia (CLL) and Richter transformation, including models of ibrutinib resistance.
Main Methods:
- In vitro studies using patient CLL cells to assess ARQ 531's effects on B-cell receptor (BCR) signaling, viability, migration, and gene transcription.
- In vivo studies using murine engraftment models (Eμ-TCL1 and Eμ-MYC/TCL1) to evaluate survival and therapeutic efficacy compared to ibrutinib.
- Assessment of ARQ 531's activity against resistant BTK (C481S) and PLCγ2 mutants.
Main Results:
- ARQ 531 effectively decreased BTK-mediated functions in CLL cells in vitro.
- ARQ 531 significantly increased survival in murine models of CLL and Richter transformation compared to ibrutinib.
- ARQ 531 inhibited CLL cell survival and suppressed BCR-mediated activation of resistant BTK and PLCγ2 mutants.
Conclusions:
- ARQ 531 is a potent, reversible multi-kinase inhibitor with promising preclinical efficacy in CLL.
- ARQ 531 demonstrates superior efficacy to ibrutinib in models of Richter transformation and overcomes common resistance mechanisms to ibrutinib.
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