Abstract
Background
Estrogen therapy (ET) plays a key role in maintaining the post-surgical quality of life of patients with endometrial cancer. This study investigated the reality of the use of ET after endometrial cancer surgery in Japan.
Methods
Using a healthcare database in Japan, patients who underwent surgery for endometrial cancer between the ages of 40 and 59 years from January 2006 to March 2021 were included. The cumulative prescriptions of ET after endometrial cancer surgeries in patients who had received chemotherapy or radiation therapy (adj-group) and those who did not (non-adj-group) was estimated using the Kaplan–Meier method.
Results
Of the 1475 patients, 115 received ET, among whom transdermal estradiol was initiated in 100 (87.0%) individuals. The cumulative proportions of ET prescription 24 months after surgery [95% confidence intervals (CIs)] were 0.088 [0.072, 0.11] in the non-adj-group and 0.058 [0.040, 0.084] in the adj-group. The cumulative proportion [95% CI] of women who received ET at 24 months after surgeries decreased with increasing age, ranging from 0.29 [0.21, 0.38] in the 40‒44 years old to 0.009 [0.002, 0.034] in the 55‒59 years old women in the non-adj-group and from 0.17 [0.094, 0.31] in the 40‒44 years old to 0 in the 55‒59 years old women in the adj-group.
Conclusion
The present study shows that ET after endometrial cancer surgery may be underused, even in women who underwent surgery between 40 and 44 years of age and without adjuvant therapy.
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Data availability
No data are available.
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Acknowledgements
We would like to thank JMDC Inc. for providing the claims data for the analysis.
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Conflict of interest
M. T. received consultation fees from Eisai Co., Ltd.; K. K. received research funds from Eisai Co., Ltd., Kyowa Kirin Co., Ltd., Sumitomo Pharma Co., Ltd., Mitsubishi Corporation, and Real World Data Co., Ltd.; consulting fees from LEBER Inc., JMDC Inc., Shin Nippon Biomedical Laboratories Ltd., and Advanced Medical Care Inc.; executive compensation from Cancer Intelligence Care Systems, Inc.; honorarium from Mitsubishi Chemical Holdings Corporation, Mitsubishi Corporation, Pharma Business Academy, and Toppan Inc.
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This study was approved by the Kyoto University Graduate School and Faculty of Medicine Ethics Committee (reference number: R3451). The need to obtain written informed consent from patients was waived, because the data were anonymized.
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Inayama, Y., Mizuno, K., Yamaguchi, K. et al. Real-world practice of estrogen therapy after surgery for endometrial cancer: a descriptive study using a Japanese claims database. Int J Clin Oncol 28, 445–453 (2023). https://doi.org/10.1007/s10147-022-02289-4
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DOI: https://doi.org/10.1007/s10147-022-02289-4