Abstract
Purpose
The minimal clinically important difference (MCID) based on patient-reported outcomes is the smallest outcome change sufficiently significant to influence management and is crucial to the design and interpretation of comparative effectiveness trials. The purpose of this study was to estimate the MCID for postoperative recovery metrics in gastrointestinal cancer patients.
Methods
This was a three-institutional cohort study. Participants were 219 patients scheduled for gastrointestinal cancer elective surgery. Body mass index (BMI), isometric knee extension torque (IKET), 6-min walk test (6 MWT), and Short-Form 36-Item Health Survey (SF-36) version 2 were evaluated 1–2 days prior to surgery (baseline) and 4 weeks after surgery. Patients received postoperative rehabilitative care from a physical therapist during hospitalization. The MCID used anchor-based methods. The anchor was a score on the SF-36 physical functioning subscale greater or lower than the average score of the general Japanese population.
Results
The receiver operating curve indicated a cutoff value on the 6 MWT of −7.8 m for clinically relevant decline (area under curve [AUC] = 0.67, 95% confidence interval [CI] = 0.599–0.741) or a 1.5% change. The cutoff value on the SF-36 role-physical subscale was −34.4 for clinically relevant decline (AUC = 0.691, 95% CI = 0.621–0.761) or a 36.6% decrease. No significant correlation was found between changes in BMI, IKET, and anchor.
Conclusion
Plausible MCIDs are present in patients with gastrointestinal cancer. These values can assist the interpretation of clinical trials and observation of the postoperative clinical course of gastrointestinal cancer surgery.
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Data availability
The authors have full control of all primary data and agree to allow the journal to review the data if required.
Code availability
Not applicable.
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Acknowledgements
The authors are grateful to the rehabilitation staff at the International University of Health and Welfare, Mita Hospital; the International University of Health and Welfare Hospital; and the International University of Health and Welfare, Ichikawa Hospital, for their help with data collection.
Funding
This study was funded by Grants-in-Aid for Scientific Research (grant number: 19K19880) from the Japan Society for the Promotion of Science.
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All the authors contributed to the conception and design of the study. Tsuyoshi Hara, Eisuke Kogure, Shinno Iijima, Yasuhisa Fukawa, Akira Kubo, and Wataru Kakuda performed the material preparation, and data collection and analysis. Tsuyoshi Hara wrote the first draft of the manuscript. All the authors commented on the initial and subsequent drafts of the manuscript. Every author read and approved the final manuscript.
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The study was approved by the Research Ethics Board of the International University of Health and Welfare, Otawara-shi, Tochigi, Japan (Registration no. 17-Io-202-2). All study procedures were conducted in accordance with ethical standards and the Declaration of Helsinki.
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Hara, T., Kogure, E., Iijima, S. et al. Minimal clinically important difference in postoperative recovery among patients with gastrointestinal cancer. Support Care Cancer 30, 2197–2205 (2022). https://doi.org/10.1007/s00520-021-06632-9
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DOI: https://doi.org/10.1007/s00520-021-06632-9