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Your search keyword '"Ikeda, Hiroshi"' showing total 18 results
Start Over Author "Ikeda, Hiroshi" Search Limiters Peer Reviewed Language english Journal international journal of radiation oncology, biology, physics
18 results on '"Ikeda, Hiroshi"'

15. Japanese Structure Survey of Radiation Oncology in 2005 Based on Institutional Stratification of Patterns of Care Study

Author

Teshima, Teruki, Numasaki, Hodaka, Shibuya, Hitoshi, Nishio, Masamichi, Ikeda, Hiroshi, Ito, Hisao, Sekiguchi, Kenji, Kamikonya, Norihiko, Koizumi, Masahiko, Tago, Masao, Nagata, Yasushi, Masaki, Hidekazu, Nishimura, Tetsuo, and Yamada, Shogo

Subjects
*ONCOLOGY, *RADIATION, *CANCER patients, *RADIOTHERAPY
Abstract

Purpose: To evaluate the structure of radiation oncology in Japan in terms of equipment, personnel, patient load, and geographic distribution to identify and improve any deficiencies. Methods and Materials: A questionnaire-based national structure survey was conducted between March 2006 and February 2007 by the Japanese Society of Therapeutic Radiology and Oncology. These data were analyzed in terms of the institutional stratification of the Patterns of Care Study. Results: The total numbers of new cancer patients and total cancer patients (new and repeat) treated with radiotherapy in 2005 were estimated at approximately 162,000 and 198,000, respectively. In actual use were 765 linear accelerators, 11 telecobalt machines, 48 GammaKnife machines, 64 60Co remote-controlled after-loading systems, and 119 192Ir remote-controlled after-loading systems. The linear accelerator systems used dual-energy function in 498 systems (65%), three-dimensional conformal radiotherapy in 462 (60%), and intensity-modulated radiotherapy in 170 (22%). There were 426 Japanese Society of Therapeutic Radiology and Oncology-certified radiation oncologists, 774 full-time equivalent radiation oncologists, 117 medical physicists, and 1,635 radiation therapists. Geographically, a significant variation was found in the use of radiotherapy, from 0.9 to 2.1 patients/1,000 population. The annual patient load/FTE radiation oncologist was 247, exceeding the Blue Book guidelines level. Patterns of Care Study stratification can clearly discriminate the maturity of structures according to their academic nature and caseload. Conclusions: The Japanese structure has clearly improved during the past 15 years in terms of equipment and its use, although the shortage of manpower and variations in maturity disclosed by this Patterns of Care Study stratification remain problematic. These constitute the targets for nationwide improvement in quality assurance and quality control. [Copyright &y& Elsevier]

Published
2008
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16. Prospective trial of radiotherapy for patients 80 years of age or older with squamous cell carcinoma of the thoracic esophagus

Author

Kawashima, Mitsuhiko, Kagami, Yoshikazu, Toita, Takafumi, Uno, Takashi, Sugiyama, Masato, Tamura, Yoichirio, Hirota, Saeko, Fuwa, Nobukazu, Hashimoto, Mitsumasa, Yoshida, Hiroshi, Shikama, Naoto, Kataoka, Masaaki, Akuta, Keizo, Sasaki, Kinro, Tamamoto, Tetsuro, Nemoto, Kenji, Ito, Hisao, Kato, Hoichi, Yamada, Shogo, and Ikeda, Hiroshi

Subjects
*ESOPHAGEAL cancer, *SQUAMOUS cell carcinoma, *CANCER radiotherapy complications, *ELECTROTHERAPEUTICS, *CANCER treatment, *CANCER patients
Abstract

Purpose: To assess the safety and efficacy of external beam radiotherapy for elderly patients with esophageal cancer. Methods and Materials: A trial testing external beam radiotherapy (66 Gy within 6.5 weeks) as a single-modality treatment was performed for biopsy-proven squamous cell carcinoma of the thoracic esophagus clinically staged as Stage I and IIA (T1–T3N0M0, International Union Against Cancer, 1987) in patients aged ≥80 years. Results: From January 1999 through December 2002, 51 evaluable patients (35 men and 16 women) with a median age of 83 years (range, 80–91 years) were enrolled from 22 institutions. Of the 51 patients, 18 (35%) had Stage T1 and 33 (65%) had Stage T2–T3 disease. Radiotherapy could be completed in 47 patients (92%) within 43–58 days (median, 49). The actuarial incidence of Grade 3 or worse cardiopulmonary complications at 3 years was 26%, with 3 early deaths, and correlated significantly with the size of the anteroposterior radiotherapy portals. The median survival time and overall survival rate at 3 years was 30 months and 39% (95% confidence interval, 25–52%), respectively. Conclusion: The results of high-dose radiotherapy in octogenarians are comparable to those in younger patients, but meticulous treatment planning and quality control is required. [Copyright &y& Elsevier]

Published
2006
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