Abstract
Background
Preclinical studies demonstrated antiproliferative synergy of 1,25-D3 (calcitriol) with cisplatin. The goals of this phase I/II study were to determine the recommended phase II dose (RP2D) of 1,25-D3 with cisplatin and docetaxel and its efficacy in metastatic non-small-cell lung cancer.
Methods
Patients were ≥18 years, PS 0–1 with normal organ function. In the phase I portion, patients received escalating doses of 1,25-D3 intravenously every 21 days prior to docetaxel 75 mg/m2 and cisplatin 75 mg/m2 using standard 3 + 3 design, targeting dose-limiting toxicity (DLT) rate <33 %. Dose levels of 1,25-D3 were 30, 45, 60, and 80 mcg/m2. A two-stage design was employed for phase II portion. We correlated CYP24A1 tagSNPs with clinical outcome and 1,25-D3 pharmacokinetics (PK).
Results
34 patients were enrolled. At 80 mcg/m2, 2/4 patients had DLTs of grade 4 neutropenia. Hypercalcemia was not observed. The RP2D of 1,25-D3 was 60 mcg/m2. Among 20 evaluable phase II patients, there were 2 confirmed, 4 unconfirmed partial responses (PR), and 9 stable disease (SD). Median time to progression was 5.8 months (95 % CI 3.4, 6.5), and median overall survival 8.7 months (95 % CI 7.6, 39.4). CYP24A1 SNP rs3787554 (C > T) correlated with disease progression (P = 0.03) and CYP24A1 SNP rs2762939 (C > G) trended toward PR/SD (P = 0.08). There was no association between 1,25-D3 PK and CYP24A1 SNPs.
Conclusions
The RP2D of 1,25-D3 with docetaxel and cisplatin was 60 mcg/m2 every 21 days. Pre-specified endpoint of 50 % confirmed RR was not met in the phase II study. Functional SNPs in CYP24A1 may inform future studies individualizing 1,25-D3.
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Acknowledgments
Supported by grants from the NIH R21CA128193-01-A, VA Merit I01CX000333-02 to NR, UL1RR024986 and University of Michigan’s Cancer Center Support Grant (5 P30 CA46592), by the use of the Cancer Center Clinical Trials Office Core.
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Ramnath, N., Daignault-Newton, S., Dy, G.K. et al. A phase I/II pharmacokinetic and pharmacogenomic study of calcitriol in combination with cisplatin and docetaxel in advanced non-small-cell lung cancer. Cancer Chemother Pharmacol 71, 1173–1182 (2013). https://doi.org/10.1007/s00280-013-2109-x
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DOI: https://doi.org/10.1007/s00280-013-2109-x