Purpose
Oncologists are now prescribing more oral chemotherapy than ever before, thus placing the onus for taking the right dose at the right time under the right circumstances directly on the patient. This study was undertaken to understand emerging adherence issues and to explore available adherence assessment tools.
Methods
This two-part study 1) examined N0747, a randomized, phase II trial that tested the oral agents, sunitinib and capecitabine, in patients with metastatic esophageal cancer an adherence standpoint; and 2) conducted a systematic review to compile and assess adherence tools that can be used in future clinical trials.
Results
First, in N0747, patients were assigned to sunitinib and capecitabine versus capecitabine; 53 chemotherapy cycles were prescribed to this 12-patient cohort. Nearly all patients denoted they “always or almost always” took their pills as prescribed, and 2 patients who reported lack of full adherence suffered grade 3+ adverse events. Surprisingly, however, over 14 cycles, 9 patients reported grade 3+ toxicity but checked “always or almost always” to describe adherence. No relationships were observed between adherence and cancer outcomes. Secondly, 21 articles identified adherence tools: 1) healthcare providers’ interviews; 2) patient-reported adherence with diaries/calendars; 3) patient-completed adherence scales; 4) medication event monitoring; 5) automated voice response; 6) drug/metabolite assays; and 7) prescription data bases. Of note, only the automated voice response seems capable of real time detection of over-adherence, as observed in N0747.
Conclusion
Oral chemotherapy adherence should be further studied, particularly from the standpoint of over-adherence.