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Published in: BMC Cancer 1/2009

Open Access 01-12-2009 | Research article

Colorectal carcinomas in MUTYH-associated polyposis display histopathological similarities to microsatellite unstable carcinomas

Authors: Maartje Nielsen, Noel FCC de Miranda, Marjo van Puijenbroek, Ekaterina S Jordanova, Anneke Middeldorp, Tom van Wezel, Ronald van Eijk, Carli MJ Tops, Hans FA Vasen, Frederik J Hes, Hans Morreau

Published in: BMC Cancer | Issue 1/2009

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Abstract

Background

MUTYH-associated polyposis (MAP) is a recessively inherited disorder which predisposes biallelic carriers for a high risk of polyposis and colorectal carcinoma (CRC). Since about one third of the biallelic MAP patients in population based CRC series has no adenomas, this study aimed to identify specific clinicopathological characteristics of MAP CRCs and compare these with reported data on sporadic and Lynch CRCs.

Methods

From 44 MAP patients who developed ≥ 1 CRCs, 42 of 58 tumours were analyzed histologically and 35 immunohistochemically for p53 and beta-catenin. Cell densities of CD3, CD8, CD57, and granzyme B positive lymphocytes were determined. KRAS2, the mutation cluster region (MCR) of APC, p53, and SMAD4 were analyzed for somatic mutations.

Results

MAP CRCs frequently localized to the proximal colon (69%, 40/58), were mucinous in 21% (9/42), and had a conspicuous Crohn's like infiltrate reaction in 33% (13/40); all of these parameters occurred at a higher rate than reported for sporadic CRCs. Tumour infiltrating lymphocytes (TILs) were also highly prevalent in MAP CRCs. Somatic APC MCR mutations occurred in 14% (5/36) while 64% (23/36) had KRAS2 mutations (22/23 c.34G>T). G>T tranversions were found in p53 and SMAD4, although the relative frequency compared to other mutations was low.

Conclusion

MAP CRCs show some similarities to micro-satellite unstable cancers, with a preferential proximal location, a high rate of mucinous histotype and increased presence of TILs. These features should direct the practicing pathologist towards a MAP aetiology of CRC as an alternative for a mismatch repair deficient cause. High frequent G>T transversions in APC and KRAS2 (mutated in early tumour development) but not in P53 and SMAD4 (implicated in tumour progression) might indicate a predominant MUTYH effect in early carcinogenesis.
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Metadata
Title
Colorectal carcinomas in MUTYH-associated polyposis display histopathological similarities to microsatellite unstable carcinomas
Authors
Maartje Nielsen
Noel FCC de Miranda
Marjo van Puijenbroek
Ekaterina S Jordanova
Anneke Middeldorp
Tom van Wezel
Ronald van Eijk
Carli MJ Tops
Hans FA Vasen
Frederik J Hes
Hans Morreau
Publication date
01-12-2009
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2009
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-9-184

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