Phase I and pharmacologic study of irinotecan and amrubicin in advanced non-small cell lung cancer |
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Authors: | Tomoko Yanaihara Masanori Yokoba Sayaka Onoda Michiko Yamamoto Shinichiro Ryuge Shintaro Hagiri Masato Katagiri Mayuko Wada Hisashi Mitsufuji Masaru Kubota Susumu Arai Hirosuke Kobayashi Nobuo Yanase Tadashi Abe Noriyuki Masuda |
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Institution: | (1) Department of Respiratory Medicine, Kitasato University School of Medicine, 1-15-1 Kitasato Sagamihara, Kanagawa 228-8555, Japan |
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Abstract: | Purpose We conducted a Phase I trial of irinotecan (CPT-11), a topoisomerase I inhibitor, combined with amrubicin, a topoisomerase
II inhibitor. The aim was to determine the maximum tolerated dose (MTD) of amrubicin combined with a fixed dose of CPT-11
as well as the dose-limiting toxicities (DLT) of this combination in patients with advanced non-small cell lung cancer.
Patients and methods Eleven patients with stage IIIB or IV disease were treated at 3-week intervals with amrubicin (5-min intravenous injection
on days 1–3) plus 60 mg/m2 of CPT-11 (90-min intravenous infusion on days 1 and 8). The starting dose of amrubicin was 25 mg/m2, and it was escalated in 5 mg/m2 increments until the maximum tolerated dose was reached.
Results The 30 mg/m2 of amrubicin dose was one dose level above the MTD, since three of the five patients experienced DLT during the first cycle
of treatment at this dose level. Diarrhea and leukopenia were the DLT, while thrombocytopenia was only a moderate problem.
Amrubicin did not affect the pharmacokinetics of CPT-11, SN-38 or SN-38 glucuronide. Except for one patient, the biliary index
on day-1 correlated well with the percentage decrease of neutrophils in a sigmoid E
max model. There were five partial responses among 11 patients for an overall response rate of 45%.
Conclusion The combination of amrubicin and CPT-11 seems to be active against non-small cell lung cancer with acceptable toxicity. The
recommended dose for Phase II studies is 60 mg/m2 of CPT-11 (days 1 and 8) and 25 mg/m2 of amrubicin (days 1–3) administered every 21 days.
This work was presented in part at the 41st Annual Meetings of the American Society of Clinical Oncology, Orlando, FL, USA
May 13–17, 2005. |
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Keywords: | CPT-11 Amrubicin Topoisomerase inhibitors Pharmacokinetics Biliary index |
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