Ryuta Sasamoto

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BACKGROUND The relationship between ascites, as detected by preoperative computed tomography (CT), and peritoneal metastasis of gastric cancer requires clarification because of its likely significance for clinical outcome. METHODS A retrospective analysis of 293 patients with advanced gastric cancer investigated the association between preoperative CT(More)
We evaluated the efficacy and toxicity of radiation combined with daily, low-dose protracted chemotherapy for locally advanced esophageal cancer. We analyzed data for 68 patients with locally advanced esophageal cancer, including 18 surgical candidates. Standard fractionation (total dose range, 60 to 70 Gy) was used for radiotherapy. The chemotherapy(More)
OBJECTIVE For locoregional failure after chemoradiotherapy (CRT) in patients with esophageal squamous cell carcinoma (ESCC), salvage esophagectomy and endoscopic mucosal resection have disadvantages, such as a high morbidity rate and a high local recurrence rate, respectively. The aim of this study was to clarify the efficacy of salvage endoscopic(More)
Local recurrence-free survival rate for myxoid liposarcoma (MLS) is related to negative surgical margins. The goal of surgery in the treatment of MLS is to obtain tumor-free surgical margins. When a tumor is adjacent to critical structures, wider resection, which can result in amputation, would be selected for local control. While recognizing that marginal(More)
OBJECTIVE The aim of this study was to review the treatment outcomes of surgery and definitive chemoradiotherapy (CRT) in elderly patients with squamous cell carcinoma of the thoracic esophagus. METHODS A total of 64 patients aged 75 or older were retrospectively reviewed; 40 were treated with surgery and 24 with CRT. The CRT group included eight patients(More)
BACKGROUND To evaluate the risks and benefits of endoscopic submucosal dissection (ESD) in addition to chemoradiotherapy (CRT) for the treatment of superficial esophageal squamous cell carcinoma (SESCC). METHODS AND MATERIALS We retrospectively reviewed the treatment outcomes of 47 patients with SESCC treated between October 2000 and December 2011.(More)
BACKGROUND Superficial esophageal cancer (SEC) is defined as esophageal cancer limited to the submucosal layers, including mucosal cancer and submucosal cancer, and is squamous cell carcinoma in most patients. In 2000, the Japanese Society of Therapeutic Radiology and Oncology (JASTRO) Study Group for SEC published a consensus guideline of standard(More)
To determine the clinical results of radiotherapy (RT) for esophageal cancer in Japan. A questionnaire-based survey was conducted for esophageal cancer treated by definitive RT between 1999 and 2003. Clinical results of definitive RT for patients were collected from 9 major institutions. Only patients with good performance status (PS 0–2) who received a(More)
AIM To analyze retrospectively the results of postoperative external beam radiotherapy (EBRT) for resected pancreatic adenocarcinoma. PATIENTS AND METHODS The records of 47 patients treated with gross complete resection (R0: 24 patients, R1: 23 patients) and post-operative EBRT were reviewed. The median dose of EBRT was 50 Gy (range, 12-60 Gy), and(More)
PURPOSE To achieve accurate tissue inhomogeneity corrections in radiotherapy treatment planning, the authors had previously proposed a novel conversion of the energy-subtracted computed tomography (CT) number to an electron density (ΔHU-ρ(e) conversion), which provides a single linear relationship between ΔHU and ρ(e) over a wide range of ρ(e). The purpose(More)