Response and Adherence to Nilotinib in Daily practice (RAND study): an in-depth observational study of chronic myeloid leukemia patients treated with nilotinib

Christel C L M Boons, Lonneke Timmers, Jeroen J W M Janssen, Peter E Westerweel, Nicole M A Blijlevens, Willem M Smit, Imke H Bartelink, Janneke A Wilschut, Eleonora L Swart, N Harry Hendrikse, Jacqueline G Hugtenburg

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Introduction: This comprehensive observational study aimed to gain insight into adherence to nilotinib and the effect of (non)adherence on exposure (C min) and treatment outcomes. Methods: Chronic myeloid leukemia (CML) patients using nilotinib were followed for 12 months. Adherence was measured by Medication Event Monitoring System (MEMS), pill count, and Medication Adherence Report Scale (MARS-5). Nilotinib C min and patient-reported outcomes (i.e., quality of life, side effects, beliefs, satisfaction) were measured at baseline, 3, 6, and 12 months. Results: Sixty-eight patients (57.5 ± 15.0 years, 49% female) participated. Median adherence to nilotinib (MEMS and pill count) was ≥ 99% and adherence < 90% was rare. Self-reported nonadherence (MARS-5) increased in the first year of treatment to a third of patients. In line with the strong beliefs in the necessity of taking nilotinib, forgetting to take a dose was more prevalent than intentionally adjusting/skipping doses. Nilotinib C min were generally above the therapeutic target in 95% of patients. Patients reported a variety of side effects, of which fatigue was most frequent. The mean C min was higher in patients who reported severe itching and fatigue. The overall 1-year MMR rate ranged from 47 to 71%. Conclusion: Substantial nonadherence (< 90%) to nilotinib was rare and nilotinib C min were generally above the therapeutic target. Lack of response in our group of patients was not related to nonadherence or inadequate C min. Nevertheless, a considerable number of patients experienced difficulties in adhering to the twice daily fasted dosing regimen, emphasizing the importance of continuous support of medication adherence in CML. Clinical trial registration: NTR3992 (Netherlands Trial Register, www.trialregister.nl).

Original languageEnglish
Pages (from-to)1213-1226
Number of pages14
JournalEuropean Journal of Clinical Pharmacology
Volume76
Issue number9
DOIs
Publication statusPublished - 1 Sep 2020

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