Abstract
Purpose
Phosphatidylinositol-3-kinase I (PI3K) inhibition sensitizes a wide range of cancer cell lines to platinum/taxane-based chemotherapy. This phase I study combines buparlisib, a pan-class 1A PI3K inhibitor, with two schedules of carboplatin and paclitaxel for patients with advanced solid tumors (ClinicalTrials.gov, NCT01297452).
Methods
There were two regimens: Group 1 received carboplatin AUC 5 and paclitaxel 175 mg/m2, on day 1 of a 21-day cycle with pegfilgrastim support; Group 2 received carboplatin AUC 5 (day 1) and paclitaxel 80 mg/m2 (days 1, 8, and 15) on a 28-day cycle without growth factor support. In both groups, three dose levels of buparlisib were explored: 50, 80, and 100 mg/day. Primary endpoint was to identify recommended phase II doses of buparlisib in both groups.
Results
Thirty subjects enrolled, 16 in Group 1 and 14 in Group 2. The DLTs were elevated alkaline phosphatase (n = 1) and uncomplicated neutropenia (n = 2). The median numbers of cycles were 5 (Group 1) and 6 (Group 2). The MTDs for buparlisib were 100 mg/day in Group 1 and 80 mg/day in Group 2. Among 25 patients with measurable disease, the confirmed objective response rate was 20 % (one complete response, four partial responses). Among three patients with known loss of PTEN expression, all derived clinical benefit from treatment.
Conclusion
The addition of buparlisib to carboplatin + paclitaxel was well tolerated, and preliminary activity was notable against tumors with loss of PTEN expression.
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Acknowledgments
They also thank Saiprasad Boddu, of Sai Life Sciences, for pharmacokinetic analyses. ClinicalTrials.gov identifier: NCT01297452. The study site received funding from Novartis Pharmaceuticals.
Conflict of interest
M.F., A.H., R.C., M.L, and M.V. have served on advisory boards and/or consulted for Novartis. No potential conflict of interest was disclosed by the other authors.
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Clinicaltrials.gov ID NCT01297452.
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Hyman, D.M., Snyder, A.E., Carvajal, R.D. et al. Parallel phase Ib studies of two schedules of buparlisib (BKM120) plus carboplatin and paclitaxel (q21 days or q28 days) for patients with advanced solid tumors. Cancer Chemother Pharmacol 75, 747–755 (2015). https://doi.org/10.1007/s00280-015-2693-z
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DOI: https://doi.org/10.1007/s00280-015-2693-z