Title |
The BTK Inhibitor ARQ 531 Targets Ibrutinib-Resistant CLL and Richter Transformation
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Published in |
Cancer Discovery, October 2018
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DOI | 10.1158/2159-8290.cd-17-1409 |
Pubmed ID | |
Authors |
Sean D. Reiff, Rose Mantel, Lisa L. Smith, J.T. Greene, Elizabeth M. Muhowski, Catherine A. Fabian, Virginia M. Goettl, Minh Tran, Bonnie K. Harrington, Kerry A. Rogers, Farrukh T. Awan, Kami Maddocks, Leslie Andritsos, Amy M. Lehman, Deepa Sampath, Rosa Lapalombella, Sudharshan Eathiraj, Giovanni Abbadessa, Brian Schwartz, Amy J. Johnson, John C. Byrd, Jennifer A. Woyach |
Abstract |
Targeted inhibition of Bruton's tyrosine kinase (BTK) with the irreversible inhibitor ibrutinib has improved outcomes for patients with hematologic malignancies, including chronic lymphocytic leukemia (CLL). Here we describe preclinical investigations of ARQ 531, a potent, reversible inhibitor of BTK with additional activity against Src family kinases and kinases related to ERK signaling. We hypothesized that targeting additional kinases would improve global inhibition of signaling pathways, producing more robust responses. In vitro treatment of patient CLL cells with ARQ 531 decreases BTK-mediated functions including B cell receptor (BCR) signaling, viability, migration, CD40 and CD86 expression, and NF-κB gene transcription. In vivo, ARQ 531 was found to increase survival over ibrutinib in a murine Eμ-TCL1 engraftment model of CLL and a murine Eμ-MYC/TCL1 engraftment model resembling Richter's transformation. Additionally, ARQ 531 inhibits CLL cell survival and suppresses BCR-mediated activation of C481S BTK and PLCγ2 mutations which facilitate clinical resistance to ibrutinib. |
X Demographics
Geographical breakdown
Country | Count | As % |
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United States | 8 | 35% |
Japan | 2 | 9% |
Saudi Arabia | 1 | 4% |
United Kingdom | 1 | 4% |
India | 1 | 4% |
Unknown | 10 | 43% |
Demographic breakdown
Type | Count | As % |
---|---|---|
Members of the public | 14 | 61% |
Scientists | 3 | 13% |
Science communicators (journalists, bloggers, editors) | 3 | 13% |
Practitioners (doctors, other healthcare professionals) | 2 | 9% |
Unknown | 1 | 4% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 78 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Ph. D. Student | 15 | 19% |
Researcher | 11 | 14% |
Other | 8 | 10% |
Student > Bachelor | 7 | 9% |
Student > Master | 4 | 5% |
Other | 7 | 9% |
Unknown | 26 | 33% |
Readers by discipline | Count | As % |
---|---|---|
Biochemistry, Genetics and Molecular Biology | 14 | 18% |
Medicine and Dentistry | 14 | 18% |
Chemistry | 9 | 12% |
Immunology and Microbiology | 3 | 4% |
Pharmacology, Toxicology and Pharmaceutical Science | 3 | 4% |
Other | 8 | 10% |
Unknown | 27 | 35% |