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Objective Adenocarcinomas of the appendix are primary malignant neoplasms of the appendix that comprise mucinous,non-mucinous(colonic-type),and signet-ring cell adenocarcinomas.Among them,mucinous adenocarcinoma is the most common type.Within the American Joint Committee on Cancer(AJCC)Staging Manual,8th edition,mucinous adenocarcinomas of the appendix are categorized by histological grade into low-grade and high-grade(well-differentiated and moderately/poorly differentiated,respectively)tumours in the AJCC TNM Staging System.While the prognostic factors for mucinous adenocarcinomas and non-adenocarcinomas remain poorly understood.The aim of this study was to investigate the clinical and pathological characteristics of mucinous appendicular adenocarcinoma with peritoneal metastasis and analyze the prognostic factors.