## Tumor Markers: Prognostic Value and Limitations **Key Point:** While LDH is a prognostic marker in testicular germ cell tumors, its prognostic significance is **secondary to histology and stage**. Histology (seminoma vs. NSGCT) and stage are primary determinants of prognosis. ### Prognostic Markers in Testicular GCT: | Factor | Prognostic Weight | Role | |--------|------------------|------| | Histology (seminoma vs. NSGCT) | **Primary** | Determines treatment & outcome | | Stage (TNM) | **Primary** | Most important prognostic factor | | LDH, hCG, AFP levels | **Secondary** | Supports risk stratification | | Marker decline kinetics | **Secondary** | Indicates treatment response | **Clinical Pearl:** IGCCCG (International Germ Cell Cancer Collaborative Group) risk classification uses histology, stage, AND marker levels together—not marker levels alone. **High-Yield:** LDH elevation in GCT correlates with tumor burden and prognosis, but histology and stage remain the dominant prognostic factors.
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