Tumor microsatellite instability and clinical outcome in young patients with colorectal cancer

R Gryfe ¹, H Kim , E T Hsieh

⁰Centre for Cancer Genetics, Samuel Lunenfeld Research Institute, Toronto, ON, Canada.

The New England Journal of Medicine +

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January 13, 2000

View abstract on PubMed

Summary

Colorectal cancer with high-frequency microsatellite instability (MSI) shows a significant survival advantage. MSI tumors also have a decreased likelihood of spreading to lymph nodes or distant organs.

Area Of Science

Oncology
Molecular Biology
Genetics

Background

Colorectal cancer (CRC) develops via distinct mutational pathways: microsatellite instability (MSI) and chromosomal instability (CIN).
Understanding pathway-specific attributes is crucial for predicting CRC clinical outcomes.

Purpose Of The Study

To investigate if CRC arising from the MSI pathway exhibits unique clinical features impacting patient prognosis.
To compare the clinical characteristics and survival rates of patients with MSI-high CRC versus microsatellite-stable (MSS) CRC.

Main Methods

Analysis of MSI status in a population-based cohort of 607 early-onset CRC patients (≤50 years at diagnosis).
Comparative analysis of clinical features and survival data between MSI-high and MSS CRC patient groups.

Main Results

High-frequency MSI (MSI-H) was identified in 17% of the studied CRC cases.
MSI-H was independently associated with a significant survival advantage (HR, 0.42; P<0.001), irrespective of tumor stage.
MSI-H CRC demonstrated a reduced risk of lymph node metastasis (OR, 0.33; P<0.001) and distant organ metastasis (OR, 0.49; P=0.02).

Conclusions

MSI-H is an independent predictor of a more favorable clinical outcome in colorectal cancer.
The presence of MSI-H in colorectal tumors is linked to a lower probability of metastatic spread.

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