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BACKGROUND This study was to devise a prognostic model for metastatic gastric cancer patients undergoing first-line chemotherapy. PATIENTS AND METHODS A retrospective analysis was carried out on 1455 gastric cancer patients, who received first-line chemotherapy from September 1994 to February 2005. RESULTS At multivariate level, poor prognostic factors(More)
BACKGROUND/AIMS The authors conducted a hospital-based case-control study to evaluate the role of Clonorchis sinensis infection as a risk factor for the development of cholangiocarcinoma (CC), including extrahepatic CC, in Korea. METHODS Cases of 185 patients with CC (intrahepatic, 51; hilar, 53; and distal extrahepatic, 81) and matched controls underwent(More)
BACKGROUND Postoperative hemorrhage, particularly delayed hemorrhage after pancreaticoduodenectomy, is a serious complication and one of the most common causes of mortality after pancreaticoduodenectomy. STUDY DESIGN The medical records of 500 patients who underwent pancreaticoduodenectomy between October 1994 and December 2002 were analyzed with regard(More)
Multiobjective optimal power plant operation requires an optimal mapping between unit load demand and pressure set point in a fossil fuel power unit (FFPU). In general, the optimization problem with varying unit load demand cannot be solved using a fixed nonlinear mapping. This paper presents a modern heuristic method, particle swarm optimization (PSO), to(More)
PURPOSE The role of adjuvant chemoradiotherapy (CRT) in D2-resected gastric-cancer patients has not been defined yet. We investigated the effect of postoperative chemoradiotherapy on the relapse rate and survival rate of patients with D2-resected gastric cancer. METHODS AND MATERIALS From August 1995 to April 2001, 544 patients received postoperative CRT(More)
BACKGROUND Although endoscopic resection can provide a wide tumor resection with a negative resection margin, it is not yet recommended as a curative therapy for ampulla of Vater cancer. METHODS To investigate the microinvasion rate and the diagnostic accuracy of endoscopic biopsy to properly judge the safety of endoscopic resection for ampulla of Vater(More)
Intraductal papillary neoplasm of bile duct (IPNB) is one of the precursor lesions of cholangiocarcinoma. Although hepatolithiasis has been extensively studied in its association with IPNBs, there had been no comprehensive study of IPNBs with Clonorchis sinensis infection. Twelve IPNBs were selected from 20 surgically resected cholangiocarcinomas, positive(More)
BACKGROUND AND AIMS No information is available on the nature of the correlation between cyclooxygenase-2 (COX-2) expression and the clinicopathological features and prognosis of cholangiocarcinoma (CC). The goal of the present study was to determine the possible roles and clinical significance of COX-2 expression in CC. METHODS We investigated the(More)
OBJECTIVE The purpose of this study was to analyze clinicopathologic and surgical features and to determine what should be an adequate extent of resection for T1 gallbladder cancers. SUMMARY BACKGROUND DATA Simple cholecystectomy offers adequate treatment for T1a cancers; however, it remains debatable whether T1b cancers should be treated by simple(More)