Abstract
Purpose
TrkB acts as an oncogenic kinase in a subset of human neuroblastomas. Lestaurtinib, a multi-kinase inhibitor with potent activity against Trk kinases, has demonstrated activity in preclinical models of neuroblastoma.
Methods
Patients with refractory high-risk neuroblastoma received lestaurtinib twice daily for 5 days out of seven in 28-day cycles, starting at 70% of the adult recommended Phase 2 dose. Lestaurtinib dose was escalated using a 3 + 3 design. Pharmacokinetics and plasma phospho-TrkB inhibitory activity were evaluated in the first cycle.
Results
Forty-seven subjects were enrolled, and 10 dose levels explored starting at 25 mg/M2/dose BID. Forty-six subjects were evaluable for response, and 42 subjects were fully evaluable for determination of dose escalation. Asymptomatic and reversible grade 3–4 transaminase elevation was dose limiting in 4 subjects. Reversible pancreatitis (grade 2) was observed in 3 subjects after prolonged treatment at higher dose levels. Other toxicities were mild and reversible. Pharmacokinetic analyses revealed rapid drug absorption, however inter-patient variability was large. Plasma inhibition of phospho-TrkB activity was observed 1 h post-dosing at 85 mg/M2 with uniform inhibition at 120 mg/M2. There were two partial responses and nine subjects had prolonged stable disease at dose levels ≥ 5, (median: 6 cycles). A biologically effective and recommended phase 2 dose of 120 mg/M2/dose BID was established.
Conclusions
Lestaurtinib was well tolerated in patients with refractory neuroblastoma, and a dose level sufficient to inhibit TrkB activity was established. Safety and signs of activity at the higher dose levels warrant further evaluation in neuroblastoma.
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Acknowledgments
This work was supported by NIH Program Project Grants P01-CA81403 (Childrens Hospital Los Angeles, PI:Seeger) and P01-CA97323 (Brodeur), R01-CA-094194 (Brodeur), and the Giulio D’Angio Endowed Chair in Neuroblastoma Research (Maris), NIH/NCRR UCSF-CTSI Grant UL1 RR024131, Alex’s Lemonade Stand Foundation, Children’s Neuroblastoma Cancer Foundation, Dougherty Family Foundation, Evan T.J. Dunbar Memorial Foundation, Neuroblastoma Children’s Cancer Society.
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Minturn, J.E., Evans, A.E., Villablanca, J.G. et al. Phase I trial of lestaurtinib for children with refractory neuroblastoma: a new approaches to neuroblastoma therapy consortium study. Cancer Chemother Pharmacol 68, 1057–1065 (2011). https://doi.org/10.1007/s00280-011-1581-4
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DOI: https://doi.org/10.1007/s00280-011-1581-4