CLL Cytogenetics

Function

CLL Cytogenetics utilizes techniques like FISH (Fluorescence In Situ Hybridization) and Karyotyping to examine the chromosomal structure of leukemic cells in Chronic Lymphocytic Leukemia (CLL). It looks for specific abnormalities—deletions, additions, or translocations—that drive the progression of the disease.

Why it is Ordered

Unlike many cancers where genetics are used for diagnosis, in CLL, cytogenetics are primarily used for prognostication and treatment selection. Because CLL is a highly variable disease (some patients live for decades without treatment, while others progress rapidly), knowing the genetic 'signature' helps oncologists decide whether to start aggressive therapy or use a 'watch and wait' approach.

Associated Conditions

• 13q deletion: Associated with a favorable prognosis and long survival times.
• Trisomy 12: Associated with an intermediate prognosis.
• 11q deletion (ATM gene): Associated with more extensive lymph node involvement and a more aggressive course.
• 17p deletion (TP53 gene): This is the most critical finding; it indicates resistance to standard chemotherapy and usually requires targeted therapies like BTK inhibitors.