Summary
Purpose
To determine the maximum tolerated dose (MTD), recommended dose, dose limiting toxicities (DLT), safety and pharmacokinetics of irofulven combined with capecitabine in advanced solid tumor patients.
Experimental design
Irofulven was given i.v. over 30 min on days 1 and 15 every 4 weeks; capecitabine was given orally twice daily, day 1 to 15. Dose levels (DL) were: irofulven (mg/kg)/capecitabine (mg/m2/day): DL1: 0.3/1,700; DL2: 0.4/1,700; DL3: 0.4/2,000; DL4: 0.5/2,000.
Results
Between May 2002 and March 2004, 37 patients were treated and 36 evaluable for MTD. DLT occurred in 1/6 evaluable patients in DL1 (grade 3 thrombocytopenia); 1/6 in DL3 (grade 3 thrombocytopenia); 2/7 in DL4 (grade 3 febrile neutropenia, grade 3 thrombocytopenia). DL4 was defined as the MTD and DL3 was established as the recommended dose (RD). DLTs occurred in 1 of 14 additional patients treated at DL3. No treatment-related deaths or grade 4 non-hematological toxicity occurred, and grade 3 toxicities were infrequent. Antitumor activity was observed; two partial responses were noted in thyroid carcinoma (DL1, DL4); one unconfirmed partial response was observed in a patient with nasopharyngeal carcinoma, (DL3); 12 patients had disease stabilization >3 months; of eight patients with hormone refractory prostate cancer (HRPC), one patient had PSA normalization and four short-term stabilizations of PSA occurred. Capecitabine and irofulven pharmacokinetics results did not suggest drug–drug interactions.
Conclusions
Irofulven with capecitabine was adequately tolerated and evidence of antitumor activity was observed. The recommended dose is irofulven 0.4 mg/kg and capecitabine 2,000 mg/m2/day.
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Acknowledgments
The authors thank Scott Lunos for statistical analysis, Scott Slough for aid in preparation of the manuscript, and the Department of Pharmacology of René Huguenin Cancer Centre for performing the drug assays. Supported by MGI PHARMA, INC., Bloomington, MN, USA.
Authors’ disclosure of potential conflicts of interest
John R. MacDonald, Ajit Shah and Garry Weems are employees and stockholders of MGI PHARMA, INC., Bloomington, MN, the sponsor of this trial. Esteban Cvitkovic is CEO and a stockholder of CAC, Kremlin-Bicêtre, France, the clinical research organization which was contracted by MGI PHARMA to conduct this and other trials of irofulven. Carmen Kahatt is an employee and stockholder of CAC.
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Alexandre, J., Kahatt, C., Bertheault-Cvitkovic, F. et al. A phase I and pharmacokinetic study of irofulven and capecitabine administered every 2 weeks in patients with advanced solid tumors. Invest New Drugs 25, 453–462 (2007). https://doi.org/10.1007/s10637-007-9071-6
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DOI: https://doi.org/10.1007/s10637-007-9071-6