Journal
CLINICAL CANCER RESEARCH
Volume 23, Issue 19, Pages 5981-5992Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1078-0432.CCR-17-0725
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Funding
- Cancer Research UK [C347/A18077]
- Royal Marsden Cancer Centre [C51/A6883]
- Experimental Cancer Medicine Centres network grant
- National Institute for Health Research Biomedical Research Centre grant
- Prostate Cancer Foundation Young Investigator Award
- Research Council/Prostate Cancer UK-Movember Foundation fellowship
- GSK
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Background: The PI3K/protein kinase B (AKT) pathway is commonly activated in several tumor types. Selective targeting of p110 beta could result in successful pathway inhibition while avoiding the on- and off-target effects of pan-PI3K inhibitors. GSK2636771 is a potent, orally bioavailable, adenosine triphosphate-competitive, selective inhibitor of PI3K beta. Methods: We evaluated the safety, pharmacokinetics, pharmacodynamics and antitumor activity of GSK2636771 to define the recommended phase II dose (RP2D). During the dose-selection and dose-escalation stages (parts 1 and 2), patients with PTEN-deficient advanced solid tumors received escalating doses of GSK2636771 (25-500 mg once daily) using a modified 3-3 design to determine the RP2D; tumor typespecific expansion cohorts (part 3) were implemented to further assess tumor responses at the RP2D. Results: A total of 65 patients were enrolled; dose-limiting toxicities were hypophosphatemia and hypocalcemia. Adverse events included diarrhea (48%), nausea (40%), and vomiting (31%). Single-and repeat-dose exposure increased generally dose proportionally. GSK2636771 400 mg once daily was the RP2D. Phospho/total AKT ratio decreased with GSK2636771 in tumor and surrogate tissue. A castrate-resistant prostate cancer (CRPC) patient harboring PIK3CB amplification had a partial response for over a year; an additional 10 patients derived durable (>= 24 weeks) clinical benefit, including two other patients with CRPC with PIK3CB alterations (>= 34 weeks). GSK2636771 400 mg once daily orally induced sufficient exposure and target inhibition with a manageable safety profile. Conclusions: Genomic aberrations of PIK3CB may be associated with clinical benefit from GSK2636771. (C) 2017 AACR.
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