Abstract
Purpose
The level of 6-sulfatoxy-melatonin (SaMT), a metabolite of melatonin, in first-void morning urine reflects blood melatonin levels from the previous night. We investigated the association between urine SaMT and sleep quality deterioration in patients with non-muscle invasive bladder cancer (NMIBC) treated with intravesical Bacillus Calmette-Guerin induction therapy (iBCG).
Methods
We enrolled 51 patients who received iBCG once weekly for 6 or 8 weeks. Patient-reported outcomes were assessed with questionnaires including the International Prostate Symptom Score (IPSS) and European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core 30 (QLQC30). Questionnaires were completed before (baseline), during, at completion, and 1 and 3 months after iBCG. Melatonin and SaMT levels at baseline were measured in serum and first-void morning urine samples, respectively.
Results
Based on changes in the QLQC30 insomnia subscale, 28 (55%) patients experienced sleep quality deterioration (deterioration group). Urine SaMT values in the deterioration group were lower than those in the non-deterioration group (P = 0.0015; 7.5 vs 15.4 ng/mg creatinine, respectively). Nocturia scores in the non-deterioration group decreased over time, while those of the deterioration group remained high after completion of iBCG. A binary logistic regression analysis revealed that low urine SaMT levels (≤ 9.6 ng/mg creatinine), high IPSS nocturia scores at baseline, and high IPSS storage subscores at baseline were associated with BCG-induced sleep quality deterioration.
Conclusions
This study confirmed the association among urine SaMT levels, nocturia, and sleep disturbance in patients with NMIBC who receive iBCG. We should be aware of treatment-induced impairments to aid in appropriate decision-making.
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Data availability
All data generated or analyzed during this study are included in this published article.
Code availability
The statistical software EZR version based on the open-source R statistical software (v.3.6.1) and PRISM software version 9.3.1 (GraphPad Software, Inc., San Diego, CA, USA). Serum melatonin level: MT ELISA Kit (OKEH02566; Aviva Systems Biology, San Diego, CA, USA). Urine 6-sulfatoxy-melatonin level: Melatonin-sulfate urine ELISA Kit (RE54031; IBL International GmbH®, Hamburg, Germany).
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Acknowledgements
The authors are grateful to their patients and the staff of our institution.
Funding
This research was supported by JSPS KAKENHI grant numbers 21592057 (Kiyohide Fujimoto), 16K20159 (Makito Miyake) and 26861290 (Kiyohide Fujimoto).
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Study conceptualization and design: Makito Miyake and Kazumasa Torimoto. Formal analysis and investigation: Nobutaka Nishimura and Sayuri Ohnishi. Funding acquisition: Makito Miyake and Kiyohide Fujimoto. Material preparation and data collection: Yuki Oda, Shunta Hori, Yosuke Morizawa, Daisuke Gotoh, Yasushi Nakai, Satoshi Anai, and Tomomi Fujii. Writing – original draft: Makito Miyake. Writing – review & editing: Nobumichi Tanaka, Kiyohide Fujimoto. All authors contributed substantially and helped revise previous versions of the manuscript. All authors read and approved the final manuscript.
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The study protocol complied with the provisions of the Declaration of Helsinki. This study was conducted according to the Declaration of Helsinki (2013) and was approved by the Ethics Committee of the Nara Medical University (protocol ID: NMU-1719). Each enrolled patient provided written informed consent.
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Miyake, M., Nishimura, N., Ohnishi, S. et al. Association between urine 6-sulfatoxy-melatonin level and intravesical Bacillus Calmette-Guerin treatment–induced sleep quality deterioration in patients with non-muscle invasive bladder cancer. Support Care Cancer 30, 6145–6153 (2022). https://doi.org/10.1007/s00520-022-07043-0
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DOI: https://doi.org/10.1007/s00520-022-07043-0