Phase II study of radiopeptide 177Lu-octreotate and capecitabine therapy of progressive disseminated neuroendocrine tumours
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In this phase II study we investigated the safety and efficacy of combination capecitabine and 177Lu-octreotate for the treatment of disseminated, progressive, unresectable neuroendocrine tumours (NETs).
Enrolled in the study were 33 patients with biopsy-proven NETs, positive 111In-octreotide scintigraphy and progressive disease measurable by CT/MRI who were to receive four cycles of 7.8 GBq 177Lu-octreotate 8-weekly, with 14 days of 1,650 mg/m2 capecitabine per day.
Of the 33 patients, 25 completed four cycles. Minimal transient myelosuppression at 3–4 weeks caused grade 3 thrombocytopenia in one patient but no neutropenia. Nephrotoxicity was absent. Critical organ radiation dosimetry provided median estimates of the dose per cycle to the kidneys of 2.4 Gy and to the liver of 4.8 Gy, and showed cumulative doses all below toxic thresholds. Objective response rates (ORR) were 24% partial response (PR), 70% stable disease (SD) and 6% progressive disease. Median progression-free survival and median overall survival had not been reached at a median follow-up of 16 months (range 5–33 months). Survival at 1 and 2 years was 91% (95% CI 75–98%) and 88% (95% CI 71–96%), respectively.
The addition of capecitabine radiosensitizing chemotherapy does not increase the minimal toxicity of 177Lu-octreotate radiopeptide therapy and led to an ORR of 24% PR and 70% minor response or SD in patients with progressive metastatic NETs. Tumour control and stabilization of disease was obtained in 94% of these patients.
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- Phase II study of radiopeptide 177Lu-octreotate and capecitabine therapy of progressive disseminated neuroendocrine tumours
European Journal of Nuclear Medicine and Molecular Imaging
Volume 38, Issue 2 , pp 302-311
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- Neuroendocrine tumours
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- Author Affiliations
- 1. Department of Oncology, Fremantle Hospital, Alma Street, Fremantle, WA, 6160, Australia
- 2. Department of Nuclear Medicine, Fremantle Hospital, The University of Western Australia, Alma Street, Fremantle, WA, 6160, Australia
- 3. Department of Radiology, Fremantle Hospital, Alma Street, Fremantle, WA, 6160, Australia