Joerg Schrader1,2, Frank O Henes3, Michael Blaeker4, Katharina Zimmermann-Fraedrich4, Andrea Pace4, Daniel Perez5, Jakob R Izbicki5, Ansgar W Lohse4, Daniel Benten4. 1. Department of Medicine - Gastroenterology and Hepatology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany. j.schrader@uke.de. 2. Department of General, Visceral and Thoracic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany. j.schrader@uke.de. 3. Department for Diagnostic and Interventional Radiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany. 4. Department of Medicine - Gastroenterology and Hepatology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany. 5. Department of General, Visceral and Thoracic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
Abstract
PURPOSE: The standard of care treatment for patients with advanced pancreatic neuroendocrine tumors (pNET) is a combination of streptozotocin and 5-FU. Although widely used, little is known about the best long-term strategy with these substances. METHODS: We here report our experience of 28 patients treated with streptozotocin/5-FU for advanced pNET with special consideration for long-term management using an extended cycle protocol. RESULTS: Standard 6-weekly Moertel protocol resulted in a median progression-free survival of 21 months (range 3-128) and a median overall survival of 69 months (range 3-157+) in the whole cohort. Thirteen of the 28 patients were switched to an extended 3-month cycle protocol for maintenance therapy. Of these 13 patients, 2 achieved complete remission, 1 partial remission, and 8 stable disease as best response while 2 showed progressive disease following switch to the extended protocol, resulting in an additional median progression-free survival of 23 months. Median overall survival after the start of chemotherapy in this patient group was 69 months (21-157+). Patients benefitted from extended periods free of chemotherapy-associated side effects after switching to the extended cycle protocol. CONCLUSIONS: Switching to an extended cycle protocol of 3 months for maintenance therapy following initial standard cycles may achieve long-term disease stabilization in selected patients with advanced pNET with good patient acceptance.
PURPOSE: The standard of care treatment for patients with advanced pancreatic neuroendocrine tumors (pNET) is a combination of streptozotocin and 5-FU. Although widely used, little is known about the best long-term strategy with these substances. METHODS: We here report our experience of 28 patients treated with streptozotocin/5-FU for advanced pNET with special consideration for long-term management using an extended cycle protocol. RESULTS: Standard 6-weekly Moertel protocol resulted in a median progression-free survival of 21 months (range 3-128) and a median overall survival of 69 months (range 3-157+) in the whole cohort. Thirteen of the 28 patients were switched to an extended 3-month cycle protocol for maintenance therapy. Of these 13 patients, 2 achieved complete remission, 1 partial remission, and 8 stable disease as best response while 2 showed progressive disease following switch to the extended protocol, resulting in an additional median progression-free survival of 23 months. Median overall survival after the start of chemotherapy in this patient group was 69 months (21-157+). Patients benefitted from extended periods free of chemotherapy-associated side effects after switching to the extended cycle protocol. CONCLUSIONS: Switching to an extended cycle protocol of 3 months for maintenance therapy following initial standard cycles may achieve long-term disease stabilization in selected patients with advanced pNET with good patient acceptance.
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