Journal of Hereditary Tumors
Online ISSN : 2435-6808
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Diagnosis, treatment, and proposal of the new classification system for the severity of desmoid tumors associated with familial adenomatous polyposis
Hideyuki Ishida Kenichi ChikataniYoshiko MoriSyuji MomoseHisato OsadaTomoki YamanoNaohiro TomitaYasuki AkiyamaKeiji HirataNaoki NugurumaTetsuji TakayamaYoshihiro NishidaHideki Ishikawa
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2020 Volume 20 Issue 2 Pages 45-58

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Abstract
Familial adenomatous polyposis (FAP) is an autosomal dominant inherited disorder characterized by multiple colorectal adenomas. Desmoid tumors (DT) are a well-known extracolonic manifestation of FAP that frequently develop in the mesentery, retroperitoneum, and/or abdominal wall in patients with FAP. DT negatively impact the quality of life and affect survival. Due to their unclear natural course and insufficient data, there is no established evidencebased medical treatment for DT. In this article, we describe the diagnosis and treatment for DT in patients with FAP, and propose a classification system for the severity of FAP-related DT, with the aim of establishing a standard treatment for this condition.
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© 2020 The Japanese Society for Hereditary Tumors
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