Background: Y-90 microsphere radioembolization is performed by injecting the microspheres through a hepatic artery catheter placed percutaneously via the femoral or brachial artery. This study assessed the efficacy of Y-90 microsphere therapy for patients with unresectable neuroendocrine tumour liver metastases (NETLMs). Potential prognostic factors were analysed for their impact on overall survival. Methods: A prospectively collected database for patients with NETLMs treated by Y-90 microspheres in two centres from 2003 to 2008 was examined retrospectively. Serial radiographic evidence was collected during follow-up to assess response. Results: Fifty-eight patients were included, 51 of whom had evaluable disease at most recent follow-up. Six patients achieved a complete response, 14 a partial response, 14 had stable disease and 17 had disease progression. Overall survival rates at 1, 2 and 3 years were 86, 58 and 47 per cent respectively; median survival was 36 (range 1-61) months. Extent of tumour involvement, radiographic response to treatment, extrahepatic disease and tumour grade were significant prognostic factors for overall survival. Conclusion: Y-90 microsphere radioembolization achieved a radiographic response in a significant proportion of patients with NETLMs.
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