tumor grade migration
The phenomenon where tumor grade changes during treatment, typically referring to grade progression from low to high-grade malignancy.
Full Definition
Tumor grade migration describes the process by which a bone or soft tissue tumor changes its histological grade during the course of treatment or natural progression. This is most commonly observed in chondrosarcomas, where low-grade tumors may dedifferentiate into high-grade lesions, particularly following incomplete excision or during recurrence. Grade migration significantly impacts prognosis and treatment planning, as higher-grade tumors require more aggressive management and have poorer outcomes. The phenomenon is also relevant in the context of radiation-induced sarcomas, where initially benign conditions may undergo malignant transformation. Recognition of grade migration is crucial for pathologists, as it affects staging, treatment decisions, and patient counseling regarding prognosis.
Usage
Usage note: Hyphenate when used as a compound modifier.
In Context
- "The recurrent lesion showed tumor grade migration from grade I to grade III chondrosarcoma." — Pathology consultation
- "Understanding tumor grade migration is essential for long-term surveillance protocols." — Oncology follow-up guidelines