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Do microsatellite instability profiles really differ between colorectal and endometrial tumors?

Ana M Ferreira¹, Helga Westers, Ying Wu

¹Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.

Genes, Chromosomes & Cancer

|April 18, 2009

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Microsatellite instability (MSI) testing is comparable for colorectal and endometrial cancers. While mutation sizes differ, the same MSI tests are suitable for both tumor types, simplifying diagnosis.

Area of Science:

Oncology
Genetics
Cancer Research

Background:

Microsatellite instability (MSI) is prevalent in Lynch syndrome and sporadic colorectal (CRC) and endometrial carcinomas (EC).
Prior research indicated lower MSI marker frequency and smaller mutation sizes in EC compared to CRC.

Purpose of the Study:

To analyze mutation type, size, and frequency at BAT and dinucleotide markers in CRC and EC.
To determine if distinct MSI profiles can differentiate between these cancer types.

Main Methods:

Analysis of mutation characteristics (type, size, frequency) at six MSI markers (three BAT, three dinucleotide).
Comparison of mutation patterns between colorectal and endometrial carcinoma samples.

Main Results:

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Mononucleotide markers predominantly shorten; dinucleotide markers can shorten or lengthen in both CRC and EC.
Mutation size (deletions/insertions) was smaller in EC compared to CRC.
The frequency of MSI was comparable between CRC and EC for both marker types.

Conclusions:

Mutation type is marker-dependent, not tissue-dependent.
Distinct MSI profiles do not clearly differentiate MSI-high CRC and EC.
Observed size differences may reflect tumor development or tissue turnover variations.
The same MSI tests are recommended for both colorectal and endometrial carcinomas.