What is the role of adjuvant RT for metastatic RCC to the thyroid resected with high-risk features?

There is no established role for adjuvant radiotherapy after thyroidectomy for RCC metastases, even with high-risk features. Most published evidence consists of small retrospective series or case reports. When RT is used, it’s generally for palliation. That said, selected high-risk cases (positive margin where re-excision is not possible, gross extrathyroidal extension invading unresectable structures) may be considered for palliative/consolidative RT for local control.

If prior radiation to the lateral neck was delivered (e.g., for another head and neck cancer), the cumulative dose to these organs is the limiting factor. If prior RT already delivered near-tolerance doses, the balance often favors close surveillance ± systemic therapy over r...