We elucidate clinical feature of appendiceal tumors. Methods: From September 1999 to May 2013, 39 appendiceal 3-MA order tumors were resected and diagnosed histologically at Ehime Prefectural Central Hospital. We evaluated their clinical features

and histological findings, retrospectively. Results: Average age was 68.0 ± 16.1 years old (range: 27–91, male: female = 10:29). The frequent symptoms were right lower quadrant pain (32.1%) and abdominal distension (17.8%). Only 21.4% of patients were diagnosed with appendiceal tumor and 14.3% were with cecal tumor preoperatively. Eleven (39.3%) had been diagnosed with appendicitis preoperatively, and 7 (25.0%) were accidentaly found in resection for other diseases. Of all 39 cases, tumor markers (CEA and CA 19-9) were examined in 19 cases. Cases that showed elevation of serum levels of CEA were 36.8% (7/19), and those showed elevation of serum levels of CA19-9 were 15.8% (3/19). Pathological findings showed benign epithelial neoplasms in 17 cases (43.6%), malignant epithelial neoplasms in 18 cases (46.1%), and carcinoid tumors in 4 cases (10.3%). Among 17 cases with benign tumors, 16 were diagnosed with mucinous cystadenoma and 1 was with tubular adenoma. Among 18 cases with malignant tumors, 14 were with adenocarcinoma, and 4 were with mucinous cystadenocarcinoma. Survival rates of malignant

cases were 83.3%/ 1 year, 66.7%/2 years, and 66.7%/3 years. Conclusion: Preoperative Bafilomycin A1 clinical trial diagnosis for appendiceal tumors was difficult. Especially in elderly patients who showed the physical and laboratory findings of appendicitis, appendiceal tumors including malignancy should be kept in mind. Key Word(s): 1. appendiceal tumors Presenting Author: KYUNG BO YOO Additional Authors: CHANG HUN LEE, BUM SU CHOUNG, SEUNG YOUNG SEO, SEONG HUN KIM, SEUNG OK LEE, SOO TEIK LEE, IN HEE KIM, DAE GHON KIM, SANG WOOK KIM Corresponding Author: KYUNG BO YOO Affiliations: Chonbuk National University Hospital, Chonbuk National RANTES University Hospital, Chonbuk National University Hospital, Chonbuk

National University Hospital, Chonbuk National University Hospital, Chonbuk National University Hospital, Chonbuk National University Hospital, Chonbuk National University Hospital, Chonbuk National University Hospital Objective: Combination therapy of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) and other anticancer agents is a promising strategy to overcome TRAIL resistance in malignant cells. Parthenolide (PT) has proven to be a promising anticancer agent recently, and several studies have explored its use in combination therapy. Here, we aimed to analyze the effects of the combination treatment using PT and TRAIL. Methods: We investigated the molecular mechanisms by which PT sensitizes colorectal cancer (CRC) cells to TRAIL-induced apoptosis.