Summary
Introduction Afatinib, an irreversible ErbB family blocker, demonstrated synergistic inhibition of epidermal growth factor receptor-mutant cell growth with pemetrexed. This phase I study investigated the maximum tolerated dose (MTD), safety, pharmacokinetics, and antitumor activity of afatinib plus pemetrexed in patients with advanced solid tumors. Methods In a 3 + 3 dose-escalation design, patients were given intravenous pemetrexed (500 mg/m2) on day 1 of a 21-day cycle (maximum 6 cycles), combined with continuous daily oral afatinib (schedule A [SA]; starting dose 30 mg, escalation to 50 mg) or pulsed-dose daily oral afatinib (schedule B [SB]; starting dose 50 mg, escalation to 70 mg) on days 1–6 of each 21-day cycle. Primary endpoint was determination of MTD based on dose-limiting toxicities (DLTs) in cycle 1. Results Fifty-three patients were treated (SA: n = 23; SB: n = 30). Eight patients had DLTs in SA, 11 patients in SB; diarrhea and fatigue were the most common. MTD of afatinib was 30 mg in SA and 50 mg in SB. Six patients in SA and eight in SB completed 6 treatment cycles. One patient in each schedule had confirmed objective response; 18/53 patients had disease control (SA: n = 7; SB: n = 11). Most frequent drug-related adverse events were diarrhea, rash, fatigue, and stomatitis. No relevant pharmacokinetic interactions were observed. Conclusions Continuous- or pulsed-dose afatinib combined with pemetrexed exhibited a manageable safety profile. Pulsed dosing conferred no apparent safety or dose advantage. Continuous-dose afatinib 30 mg/day with pemetrexed is recommended for phase II studies.
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Acknowledgments
The authors would like to acknowledge the support of all trial investigators and clinical trial support staff, and of all patients and their families participating in this study. The authors would also like to thank Roxana Sufan and Yu Gu, previously employed by Boehringer Ingelheim, for their contributions to the study and article development.
The authors were fully responsible for all content and editorial decisions, were involved at all stages of article development, and have approved the final version. Medical writing assistance, supported financially by Boehringer Ingelheim, was provided by Gill McFeat of Ogilvy Healthworld and Katie McClendon of GeoMed, part of KnowledgePoint360, an Ashfield Company, during the preparation of this article.
Financial support
This clinical research is supported by the sponsor, Boehringer Ingelheim. Medical writing assistance was supported financially by Boehringer Ingelheim.
Ethics statement
The study was conducted in accordance with the Declaration of Helsinki and guidelines on Good Clinical Practice, and the protocol was approved by a local ethics committee at each participating center. Written informed consent consistent with the International Conference on Harmonization Good Clinical Practice guidelines was obtained.
Conflict of interest
Q. S. Chu has served on advisory boards for Boehringer Ingelheim. R. Sangha has served on advisory boards and has received educational sponsorship from Boehringer Ingelheim. V. K. Chand and D. Schnell are full-time employees of Boehringer Ingelheim Pharmaceuticals Inc. G. Sergenson, S. J. Hotte, and H. W. Hirte declare no potential conflicts of interest.
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NCT01169675 (ClinicalTrials.gov).
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Chu, Q.S., Sangha, R., Hotte, S.J. et al. A phase I, dose-escalation trial of continuous- and pulsed-dose afatinib combined with pemetrexed in patients with advanced solid tumors. Invest New Drugs 32, 1226–1235 (2014). https://doi.org/10.1007/s10637-014-0139-9
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DOI: https://doi.org/10.1007/s10637-014-0139-9