Koichi Harashima

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PURPOSE To investigate the incidence and severity of rectal bleeding after high-dose hypofractionated radiotherapy (RT) for prostate cancer, and to explore the factors affecting the incidence of Grade 2 or worse rectal bleeding. METHODS AND MATERIALS The data of 52 patients who had been treated by external beam RT for localized prostate cancer between(More)
PURPOSE To analyze the results of clinically node-negative, localized hormone-refractory prostate cancer treated with external beam radiotherapy (EBRT) and to investigate the potential prognostic factors that influenced the therapeutic outcome. METHODS AND MATERIALS Fifty-three patients who had developed localized hormone-refractory prostate cancer were(More)
Until now, there has not been enough information on how androgens or androgen deprivation may influence the response of cancer cells to radiation. In this study, the effect of dihydrotestosterone (DHT) on cellular proliferative activity and radiosensitivity was examined in a hormone-sensitive human prostate cancer cell line, LNCaP. In addition, the study(More)
PURPOSE Several investigations have revealed that the alpha/beta ratio for prostate cancer is atypically low, and that hypofractionation or high-dose-rate (HDR) brachytherapy regimens using appropriate radiation doses may be expected to yield tumor control and late sequelae rates that are better or at least as favorable as those achieved with conventional(More)
PURPOSE The aim of the study is to develop high-dose-rate (HDR) conformal interstitial brachytherapy by means of combined CT-fluoroscopy guidance with CT-based treatment planning for locally recurrent rectal carcinoma. METHODS AND MATERIALS Brachytherapy needle insertion was guided with a helical CT scanner providing continuous fluoroscopy reconstruction.(More)
PURPOSE To examine the ability of a heat shock protein 90 (Hsp90) chaperone complex inhibitor, radicicol, to modify thermal response and heat-induced cell killing, and to clarify the underlining mechanisms. MATERIALS AND METHODS A human oesophageal cancer cell line (TE-1), with a mutant p53 gene, was used. To examine the effect of radicicol on(More)
BACKGROUND Optimal timing of the measurement of serum squamous cell carcinoma (SCC) antigen during radiation therapy (RT) and its significance for predicting the response of cervical carcinoma patients as early as possible remain unknown. METHODS Sixty-three patients with SCC of the uterine cervix who received RT only were studied. Patients were treated(More)
PURPOSE The purpose of this study was to examine how selective inhibition of the survival signal transduction pathways affects radiosensitivity in human cancer cell lines. MATERIALS AND METHODS Two human esophageal cancer cell lines, TE-1 (mutant p53) and TE2 (wild-type p53), were used. To inhibit the pathways selectively, 3 specific kinase inhibitors,(More)
PURPOSE The aim of this study was to investigate the cell killing induced by low dose-rate irradiation (LDRI) simultaneously combined with long duration mild hyperthermia in LK87 human lung cancer cells. Cell cycle alteration due to this combined treatment was also observed. MATERIALS AND METHODS Human lung adenocarcinoma cells, LK87, were treated with(More)
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