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Published in: Breast Cancer Research and Treatment 2/2016

01-01-2016 | Epidemiology

Choice of study endpoint significantly impacts the results of breast cancer trials evaluating chemotherapy-induced nausea and vomiting

Authors: Terry Ng, Sasha Mazzarello, Zhou Wang, Brian Hutton, George Dranitsaris, Lisa Vandermeer, Stephanie Smith, Mark Clemons

Published in: Breast Cancer Research and Treatment | Issue 2/2016

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Abstract

Multiple endpoints can be used to evaluate chemotherapy-induced nausea and vomiting (CINV). These endpoints reflect the various combinations of vomiting, nausea and rescue antiemetic use in the acute (0–24 h), delayed (>24–120 h) and overall (0–120 h) periods after chemotherapy. As the choice of outcome measure could potentially change the interpretation of clinical trial results, we evaluated CINV rates using different endpoints on a single dataset from a prospective cohort. Data from 177 breast cancer patients receiving anthracycline and cyclophosphamide-based chemotherapy was used to calculate CINV control rates using the 15 most commonly reported CINV endpoints. As nausea remains such a significant symptom, we explored the frequency at which pharmaceutical and non-pharmaceutical company-funded studies included measures of nausea in their primary study endpoint. CINV control rates ranged from 12.5 %, 95 % (CI 7.6–17.4 %) for total control (no vomiting, no nausea and no rescue medication) in the overall period to 77.4 %, 95 % (CI 71.2–83.6 %) for no vomiting in the overall period. Similar differences were found in the acute and delayed periods. Non-pharmaceutical company-funded trials were more likely to include a measure of nausea in the primary study outcome (9/18, 50 %) than pharmaceutical-funded trials (1/12, 8.3 %). The choice of trial endpoint has an important impact on reported CINV control rates and could significantly impact on interpretation of the results. Primary endpoints of studies, including those mandated by regulatory bodies, should account for nausea to reflect patient experience. Reporting of endpoints should be more comprehensive to allow for cross-trial comparisons.
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Metadata
Title
Choice of study endpoint significantly impacts the results of breast cancer trials evaluating chemotherapy-induced nausea and vomiting
Authors
Terry Ng
Sasha Mazzarello
Zhou Wang
Brian Hutton
George Dranitsaris
Lisa Vandermeer
Stephanie Smith
Mark Clemons
Publication date
01-01-2016
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 2/2016
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-015-3669-8

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