Assessment of microsatellite instability in colorectal carcinoma at an Indian center
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- Pandey, V., Prabhu, J.S., K., P. et al. Int J Colorectal Dis (2007) 22: 777. doi:10.1007/s00384-006-0241-3
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The purpose of the present study was to evaluate the frequency of microsatellite instability (MSI) in colorectal cancers in an Indian cohort.
Materials and methods
Paraffin embedded tissue samples of colorectal cancers from 46 patients were assessed for mismatch repair protein expression (hMLH1 and hMSH2) by immunohistochemistry. Subsequently, MSI analysis was done after PCR amplification of five Bethesda markers.
Amongst 46 cases studied, only 5 patients (10.8%) showed MSI. Out of these, two (4.3%) had high microsatellite instability (MSI-H) and three (6.5%) showed low microsatellite instability (MSI-L). Out of 46 cases, 41 were microsatellite stable (MSS). In the 46 cases tested by immunohistochemistry, 7 (15.7%) showed the absence of hMLH1 and 1 case showed the absence of hMSH2.
Our study indicates a similar rate of incidence of MSI in colorectal cancers in the Indian cohort compared to the West (10–15%) despite lower incidence of colorectal cancers and predominance of rectosigmoid tumors in the Indian population.
KeywordsMicrosatellite instabilityColorectal cancerhMLH1hMSH2ImmunohistochemistryPCR
microsatellite instability low
microsatellite instability high
hereditary non-polyposis colorectal cancer
- H & E
hematoxylin and eosin
College of American Pathologists
human mutL homolog 1
human mutS homolog 2