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Microsatellite instability (MSI) is a DNA repair deficiency found in some colorectal cancers (CRC). MSI CRC has distinct characteristics and screening utility, particularly for Lynch syndrome, but its prognostic and predictive value is still under investigation.

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Microsatellite instability (MSI) affects approximately 20% of right-sided and 5% of left-sided colon and rectal cancers.
  • This deficiency leads to widespread mutations in nucleotide repeats within cancer-related genes.
  • A standardized definition for MSI based on mononucleotide repeat deletions is increasingly accepted.

Purpose of the Study:

  • To review the characteristics and clinical implications of MSI in colorectal cancer.
  • To explore the different pathways leading to MSI CRC in younger and older patients.
  • To assess the current understanding of MSI's role in prognosis, chemotherapy response, and therapeutic strategies.

Main Methods:

  • Literature review and synthesis of existing research on MSI in colorectal cancer.
  • Analysis of histological features, genetic pathways, and clinical outcomes associated with MSI CRC.
  • Evaluation of MSI's utility as a screening marker and its potential in novel therapeutic approaches.

Main Results:

  • MSI CRC exhibits distinct histological features, including abundant tumor-infiltrating lymphocytes and poor differentiation.
  • Two main pathways contribute to MSI CRC: chromosomal instability in younger patients and hypermethylation-induced MLH1 silencing in older patients.
  • MSI is unlikely to be a prognostic marker for early-stage CRC, and its predictive value for chemotherapy response is controversial.

Conclusions:

  • The distinct pathways leading to MSI CRC may explain varied clinical properties.
  • MSI is a valuable marker for screening Lynch syndrome, a hereditary cancer condition.
  • Further research is ongoing to investigate MSI for novel therapeutic strategies, including synthetic lethality.