Incidence, Clinicopathological Features and Oncologic Outcome of Appendiceal Neoplasms: A Single-Center Cohort Study

Abstract

Appendiceal tumors represent a large amalgam of different tumor lineages. The continuous evolution in their pathological classifications has led to some variable recommended attitudes over time. The aim of this study is to review the incidence, clinicopathological characteristics, therapeutic approach and oncological results in this type of tumor at our institution. This is a single-centre retrospective cohort study. Every pathologic report catalogued as an appendiceal specimen was reviewed for a time period of 5 years (2013–2017) at our institution. Demographic, clinical, pathological and oncologic follow-up data were recorded. A descriptive study of the sample was completed. A total of 1434 appendiceal specimens was analyzed. Appendiceal neoplasms incidence was 3.2%. Epithelial tumors were the predominant histological subtype, making up 68% of the cases. Low-grade appendiceal mucinous neoplasia and neuroendocrine tumors were the most frequent neoplasms with malignant potential, with 13 and 6 cases, respectively. In more than 80% of neoplasia cases, the definitive treatment was appendectomy. Mortality cases were related to tumors with a very poor prognosis and an advanced stage. All patients had adequate oncological follow-up. Although it is still quite rare, the incidence of appendiceal tumors is increasing with an epidemiological change in favor of mucinous neoplasms currently predominating. Therefore, it is necessary to know and use an updated anatomo-pathological classification in order to provide correct treatment in the first or second surgical stage, as well as the correct follow-up of patients.