molecular markers
Genetic and biochemical characteristics of tumor tissue that provide diagnostic, prognostic, and therapeutic guidance.
Full Definition
Molecular markers in neurosurgical oncology refer to specific genetic, epigenetic, and biochemical characteristics of brain tumors that provide crucial information for diagnosis, prognosis, and treatment selection. These markers include gene mutations (such as IDH1/2), chromosomal alterations (1p/19q codeletion), protein expression patterns, and epigenetic modifications (MGMT promoter methylation). Modern brain tumor classification increasingly relies on molecular markers in addition to histological features, as these markers often provide more accurate prognostic information and guide therapeutic decisions. For example, IDH-mutated gliomas generally have better outcomes than IDH-wildtype tumors, while MGMT methylation status predicts response to alkylating chemotherapy. Molecular profiling has revolutionized neuro-oncology by enabling personalized treatment approaches.
Usage
Usage note: Often reported as positive/negative or wildtype/mutated; increasingly important for classification.
In Context
- "Molecular markers confirmed IDH1 mutation and 1p/19q codeletion consistent with oligodendroglioma." — pathology report
- "Treatment selection was based on molecular markers rather than histology alone." — multidisciplinary conference