How Is MSI (Microsatellite Instability) Diagnosed? Methods and Importance Explained
Learn how MSI is diagnosed using PCR and IHC testing methods on tumor tissues for better targeted cancer treatment.
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MSI (Microsatellite Instability) is diagnosed through molecular testing of tumor tissue. The two primary methods are PCR (Polymerase Chain Reaction) which detects changes in length of microsatellites, and IHC (Immunohistochemistry) which checks for the presence of specific proteins related to DNA repair. If the tumor shows MSI, it can suggest a more targeted treatment plan.
FAQs & Answers
- What is MSI and why is it important in cancer diagnosis? MSI (Microsatellite Instability) is a genetic condition characterized by changes in microsatellite lengths within tumor DNA and indicates defects in DNA repair mechanisms, helping guide targeted cancer treatments.
- What are the main methods used to diagnose MSI? MSI is primarily diagnosed using PCR (Polymerase Chain Reaction) to detect microsatellite length changes, and Immunohistochemistry (IHC) to assess the presence of DNA repair proteins in tumor tissue.
- How does identifying MSI affect cancer treatment plans? Detecting MSI in tumors can suggest specific targeted therapies, as cancers with MSI often respond differently to immunotherapy and other precision medicine approaches.