A Phase I Clinical Trial of Irinotecan and Carboplatin in Patients with Extensive Stage Small Cell Lung CancerCrabb S.J. · Bradbury J. · Nolan L. · Selman D. · Muthuramalingam S.R. · Cave J. · Johnson P.W.M. · Ottensmeier C.
aDepartment of Medical Oncology, University Hospital Southampton NHS Foundation Trust, and bCancer Research UK Centre, University of Southampton Faculty of Medicine, Southampton General Hospital, Southampton, and cDepartment of Medical Oncology, Portsmouth Hospitals NHS Trust, Queen Alexandra Hospital, Portsmouth, UK
Background: Treatment options for small cell lung cancer (SCLC) remain inadequate. Irinotecan has been tested in various combinations with platinum agents but the optimal regimen remains uncertain. We undertook a phase I trial to optimise the dose intensity of a 3-weekly irinotecan/carboplatin combination. Methods: Twenty patients with extensive stage SCLC received intravenous carboplatin at an area under the curve (AUC) of 5 on day 1, and irinotecan in 40–70 mg/m2 dose levels on days 1 and 8, every 21 days, for up to 6 cycles. Results: Dose-limiting toxicity occurred in 1 patient at the 50 mg/m2 irinotecan level (grade 3 diarrhoea) and in 2 patients at 70 mg/m2 (grade 5 neutropenic sepsis; combined grade 4 febrile neutropenia, grade 4 diarrhoea and grade 3 thrombosis). Toxicity patterns were consistent with the expected profile for this combination. The objective response rate was 75% and the median survival was 9.3 months (95% confidence interval 7.5–11.2). Conclusion: Irinotecan 60 mg/m2 on days 1 and 8 combined with carboplatin AUC 5 every 21 days is recommended for phase II evaluation. This regimen has clinical activity, acceptable toxicity and greater dose intensity over those currently tested in phase III trials.
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