Dose Volume Analysis of Radiotherapy for Inoperable Patients with Stage I–II Endometrial Carcinoma
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概要
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This study aims to assess the efficacy and toxicity of definitive radiotherapy for early-stage endometrial carcinoma. The correlation between CT-based dosimetric parameters and clinical outcomes is also evaluated. Between 2002 and 2006, 10 medically inoperable patients with T1-2 endometrial carcinoma were treated with radiotherapy alone. A combination of external beam radiotherapy (EBRT) and high-dose-rate intracavitary brachytherapy (HDR-ICBT) was used for 9 patients, and one was treated with HDR-ICBT alone. Dose prescription of HDR-ICBT was determined in reference to CT images at brachytherapy, and a total dose of 22–24 Gy in 4 fractions was delivered to the outer perimeter of the uterine corpus. Dose-volume parameters of the gross tumor volume (GTV), clinical target volume (CTV), and organs at risk were assessed retrospectively using the dose-volume histograms derived from the CT image-based treatment planning system. After a median follow-up of 55 months, 9 patients were alive without evidence of recurrence. One patient died from liver cirrhosis 17 months after radiotherapy. Severe acute and late toxicities were not observed in any of the patients. Average minimum dose to 90% of GTV and CTV (D90) was 88.0 and 45.9 GyEQD2, respectively. The minimum dose delivered to 2 cc of the most irradiated volumes of the rectum and sigmoid colon (D2cc) was 78.9 and 65.9 GyEQD2, respectively. These patients developed Grade 1 late complications. In this study, stage I–II endometrial carcinoma was well-controlled locally with minimum late toxicity by radiotherapy alone with HDR-ICBT. 3D image-based brachytherapy may potentially deliver a sufficiently high dose to the whole tumor without significant increase in dose to surrounding normal tissues.
著者
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KIYOHARA Hiroki
Research Center Hospital for Charged Particle Therapy, National Institute of Radiological Sciences
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Noda Shin-ei
Department Of Radiation Oncology Gunma University Graduate School Of Medicine
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Nakano Takashi
Department Of Anatomy Aichi Medical University
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Kato Shingo
Research Center Hospital For Charged Particle Therapy National Institute Of Radiological Sciences
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Ohno Tatsuya
Gunma University Heavy Ion Medical Center Gunma University Graduate School Of Medicine
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Kato Hirotoshi
Division Of Radiation Medicine National Institute Of Radiological Sciences
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Suzuki Kazutoshi
Department Of Medical Imaging National Institute Of Radiological Sciences
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OHKUBO Yu
Hidaka Hospital
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TSURUOKA Ichiro
Research Center for Charged Particle Therapy, National Institute of Radiological Sciences
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TAMAKI Tomoaki
Applied Radiation Biology and Radiotherapy Section, International Atomic Energy Agency
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