Serrated lesions of the appendix in serrated polyposis patients

Bettington, Mark, Brown, Ian S. and Rosty, Christophe (2016) Serrated lesions of the appendix in serrated polyposis patients. Pathology, 48 1: 30-34. doi:10.1016/j.pathol.2015.11.012

Author Bettington, Mark
Brown, Ian S.
Rosty, Christophe
Title Serrated lesions of the appendix in serrated polyposis patients
Journal name Pathology   Check publisher's open access policy
ISSN 1465-3931
Publication date 2016-01-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.pathol.2015.11.012
Open Access Status Not Open Access
Volume 48
Issue 1
Start page 30
End page 34
Total pages 5
Place of publication London, United Kingdom
Publisher Lippincott Williams & Wilkins
Language eng
Formatted abstract
Patients with serrated polyposis develop multiple serrated polyps throughout the large bowel: hyperplastic polyps (HP), sessile serrated adenomas (SSA) and traditional serrated adenomas (TSA). The frequency and the characteristics of serrated lesions of the appendix have not been reported in serrated polyposis patients. We conducted a retrospective study of 34 serrated polyposis patients who underwent a total or right hemicolectomy for adenocarcinoma or polyp burden. An appendiceal serrated lesion was identified in 23 (68%): 13 SSAs, three SSAs with dysplasia, four HPs and three TSAs. The BRAFV600E mutation was present in four polyps, all of SSA subtype (one with dysplasia). KRAS mutations were identified in 11 polyps (48%), in more than half of SSAs and of TSAs, and in none of the four HPs. None of the polyps displayed high levels of CpG island methylator phenotype (CIMP). There was no methylation in the promoter of the MLH1, p16 or MGMT gene. Serrated lesions of the appendix are frequently found in serrated polyposis patients and are most commonly of SSA-type morphology, frequently associated with KRAS mutation. It is unclear if appendiceal serrated polyps are a feature of serrated polyposis or a lesion frequently identified in association with a proximal colonic adenocarcinoma.
Keyword Appendix
Serrated polyposis
Serrated polyps
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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