| ORIGINAL ARTICLE |
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| Year : 2016 | Volume
: 53
| Issue : 4 | Page : 513-517 |
Microsatellite instability in stage II colorectal cancer: An Indian perspective
AP Dubey, S Vishwanath, P Nikhil, A Rathore, A Pathak
Department of Medical Oncology, Army Hospital (Research and Referral), New Delhi, India
Correspondence Address:
A Rathore
Department of Medical Oncology, Army Hospital (Research and Referral), New Delhi
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0019-509X.204772
INTRODUCTION: Around 80% of colorectal carcinoma are associated with chromosomal instability (CIN) while rest of 20 % are euploid, possessing defect in mis match repair system (MMR) quintessential for surveillance and correction of errors in introduced into microsatellites. MATERIALS AND METHODS: We analyse all stage II CRC for MSI who presented at MDTC at Army hospital (research and refrral) new delhi during last 2 years (Jan 14 to Dec 2015). RESULTS: We found that 22.2% patients out of 45 patients with stageII CRC being MSI-. high. We also noticed all suchcases were associated with loss of expression of PMS2 & MLH1, that was in contrast other studies where loss of MLH1 and [email protected], MSH6 were seen more commonly. CONCLUSION: MSI occurs in a significant proportion of colorectal cancers in young (<50 years old) patients. Young age at colorectal cancer diagnosis, proximal tumor location, family history of colorectal cancer were independent predictors of MSI status in our patients. In a proportion of these young patients with MSI tumors, loss of expression of proteins by 2 MMR genes PMS2 and hMLH1 has been identified.
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