Randomized trials have established that single-fraction radiation to a previously unirradiated, uncomplicated peripheral bone or vertebral metastasis provides comparable pain relief and morbidity compared to multiple-fraction regimens, while optimizing patient and caregiver convenience. Although it results in a higher incidence of retreatment at a later date (20% vs. 8 % for multi-fraction regimens), the decreased patient burden usually outweighs any considerations of long-term effectiveness for those with a limited life expectancy.
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