Publications by authors named "N Shikama"

Utility values of responders and nonresponders are essential inputs in cost-effectiveness studies of radiation therapy for painful bone metastases but, to our knowledge, they have not been reported separately. We sought to determine the utility values of responders and nonresponders using data from a prospective observational study on bone metastases. The original prospective observational study was conducted at 26 centers in Japan.

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This study developed a system to reduce the treatment planning time for cervical cancer brachytherapy. An in-house Excel spreadsheet was developed to streamline dosimetric evaluation by combining external beam radiotherapy and brachytherapy doses, while also displaying daily dose constraints, a novel feature of the system. This system was validated in 46 consecutive patients who underwent intracavitary and interstitial brachytherapy using several applicators and required more complex dose calculation procedures than intracavitary brachytherapy alone.

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The treatment options for differentiated thyroid cancer (DTC) are surgery, thyroid stimulating hormone suppression, radioactive iodine, and multitargeted tyrosine kinase inhibitors. The role of external-beam radiotherapy (EBRT) for DTC is controversial because of the lack of randomized controlled trials, but prospective single-arm studies and propensity score matching analyses have shown its efficacy and safety. This review discusses the role of EBRT after resection of gross disease, when there is a high risk of locoregional failure, as well as its role for locoregionally gross recurrent and unresectable disease.

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Article Synopsis
  • This study aimed to evaluate the real-world impact of radiotherapy for bone metastases on patients' quality of life (QOL) using data from 26 centers in Japan.
  • Out of 333 patients receiving treatment, 232 were included, and their QOL was assessed at enrollment and followed up at two and six months using standardized questionnaires.
  • Results showed significant improvements in several QOL areas, especially pain and insomnia, indicating that radiotherapy can positively affect some aspects of patient well-being in practice.
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