NDLI: Microsatellite instability in colorectal cancer is associated with local lymphocyte infiltration and low frequency of distant metastases

Content Provider	PubMed Central
Author	Buckowitz, A. Knaebel, H-p Benner, A. Bläker, H. Gebert, J. Kienle, P. Von, Knebel Doeberitz M. Kloor, M.
Copyright Year	2005
Abstract	Colorectal carcinomas (CRCs) with high microsatellite instability (MSI-H) share clinicopathological features distinctly different from their microsatellite stable (MSS) counterparts. Unlike MSS cancers, MSI-H CRCs occur predominantly in the right-sided colon and are often characterised by a strong lymphocyte infiltration. A poor differentiation pattern is found in most MSI-H CRCs, even though patients with MSI-H carcinomas seem to have a significantly longer survival after surgical resection. To clarify which factors contribute to the obvious paradoxon of a more favourable prognosis of MSI tumours, several clinical and histopathological features as well as the microsatellite status were evaluated in 120 colorectal cancer cases fulfilling clinical criteria (Bethesda) indicative for familial colorectal cancer. Microsatellite instablity status and lymphocyte infiltration were related to tumour stage and patients' follow-up. Statistical analysis confirmed well-known relations, such as enhanced lymphocyte infiltration accompanied by Crohn's like reaction (CLR) in MSI-H cancers (CLR+ in 27 out of 47 MSI-H vs 14 out of 71 MSS CRCs, P<0.001). However, after stratification for depth of local invasion and penetration of the primary tumour, T3 tumours displaying MSI had a significantly lower rate of distant metastases (M1 in four out of 35 MSI-H vs 20 out of 41 MSS CRCs, P<0.001). A similar tendency was observed for CLR-positive CRCs (M1 in six out of 29 CLR+ vs 17 out of 45 CLR− CRCs, P=0.13). In a logistic regression model, the MSI-H phenotype and the presence of CLR were independent predictors of a low UICC stage (P=0.006 and 0.04, respectively). These data, together with the recent definition of highly immunogenic neo-antigens expressed in MSI-H tumour cells, suggest that MSI-H CRCs elicit a protective host response that may prevent metastasis formation.
Related Links	http://dx.doi.org/10.1038/sj.bjc.6602534
Ending Page	1753
Page Count	8
Starting Page	1746
File Format	PDF
ISSN	00070920
e-ISSN	15321827
Journal	British Journal of Cancer
Issue Number	9
Volume Number	92
Language	English
Publisher	Nature Publishing Group
Publisher Date	2005-05-09
Access Restriction	Open
Rights Holder	Nature Publishing Group
Subject Keyword	Cancer Research Oncology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cancer Research Oncology

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