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Peptide receptor radionuclide therapy with Y-DOTATOC and (177)Lu-DOTATOC in advanced neuroendocrine tumors: results from a Danish cohort treated in Switzerland

Peptide receptor radionuclide therapy with Y-DOTATOC and (177)Lu-DOTATOC in advanced neuroendocrine tumors: results from a Danish cohort treated in Switzerland

Neuroendocrinology 93(3): 189-196

ISSN/ISBN: 0028-3835

PMID: 21335949

DOI: 10.1159/000324096

Limited therapeutic options have highlighted the demand for new treatment modalities for patients with advanced neuroendocrine tumors (NET). Promising results of initial studies have warranted the implementation of peptide receptor radionuclide therapy (PRRT) in clinical practice. However, this treatment option still needs clinical evaluation. In this study, we evaluated the PRRT treatment response of 69 Danish patients with NET mainly originating from the gastroenteropancreatic system. Fifty-six patients (81%) were referred for PRRT to the Department of Nuclear Medicine, University Hospital Basel, Switzerland, between 2004 and 2008 due to progression assessed by the referring physicians. However, when retrospectively evaluated, only 42 of the 69 patients (61%) had progression according to RECIST (Response Evaluation Criteria in Solid Tumors). Most patients were treated with ⁹⁰Y-DOTATOC. Based on RECIST, a complete response was observed in 5 patients (7.4%), a partial response in 11 patients (16.2%) and stable disease in 42 patients (61.8%). Progressive disease after completed therapy was observed in 10 patients (14.7%). The median progression-free survival was 29 months (95% CI: 22-36 months). Pancreatic NET seemed to respond better to PRRT than small intestinal carcinoid tumors (p = 0.03). The overall frequency of serious adverse events was low. Implementation of PRRT in clinical routine has provided a valuable new therapeutic option for the treatment of advanced NET. We suggest that PRRT may advance from second- or third-line to first- or second-line therapy in inoperable/unresectable NET patients.

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Accession: 054914385

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