Microsatellite instability in colorectal cancer

Area of Science:

• Oncology
• Genetics
• Molecular Biology

Background:

• Colorectal cancer (CRC) is a heterogeneous disease influenced by genetic and environmental factors.
• Early detection significantly increases CRC curability.
• Molecular alterations in CRC include Chromosomal Instability (CIN), Microsatellite Instability (MSI), and CpG Island Methylator phenotype (CIMP).

Purpose of the Study:

• To provide a comprehensive summary of updated knowledge on colorectal cancer classification.
• To detail the diagnostic features of microsatellite instability (MSI).
• To highlight the growing importance of MSI analysis in CRC patient management.

Main Methods:

• Review of current literature on colorectal cancer molecular classification.
• Analysis of the molecular basis and characteristics of microsatellite instability (MSI).
• Examination of the diagnostic, prognostic, and therapeutic implications of MSI determination in CRC.

Main Results:

• Microsatellite instability (MSI) arises from defective DNA mismatch repair (MMR) and is characterized by alterations in DNA repeat sequences.
• Approximately 15-20% of colorectal cancers exhibit MSI.
• MSI status has significant prognostic and therapeutic implications, aiding in tumor detection and classification.

Conclusions:

• Microsatellite instability (MSI) is a key molecular marker in colorectal cancer.
• Accurate determination of MSI status is essential for personalized CRC treatment strategies.
• Continued research and application of MSI analysis will enhance patient outcomes in colorectal cancer care.