Real-world treatment patterns in advanced pancreatic neuroendocrine tumors in the era of targeted therapy: perspectives from an academic tertiary center and community oncology practices

Abstract

Pancreatic neuroendocrine tumors (pNETs) are rare, slow-growing cancers. Optimal treatment of advanced pNETs is unclear. The aim of this study was to examine treatment patterns and preferences among an academic tertiary medical center and community-based oncology practices. Retrospective chart review was performed for patients with newly diagnosed locally advanced, metastatic, or unresectable pNET diagnosed between January 2010 and December 2013 at an academic tertiary cancer center [University of California, San Francisco (UCSF)] or a large network of community oncology practices [Altos Solutions' OncoEMR database (ALTOS)]. Fifty-four eligible patients (N _UCSF = 23; N _ALTOS = 31) were identified. Median time to treatment initiation was 1.1 months; median follow-up time was 22.9 months. UCSF patients underwent more lines of therapy than ALTOS patients despite similar follow-up times. UCSF tended toward more invasive treatment than ALTOS. The median time to treatment discontinuation was statistically significantly shorter for patients on chemotherapy than on targeted therapy in the combined UCSF and ALTOS groups (chemotherapy = 2.1 months vs. targeted = 18.6 months, p < 0.001). Treatment patterns and duration for newly diagnosed advanced pNETs vary widely both within and between different practice settings. Further studies are warranted to investigate the significant difference in duration of targeted therapy compared to chemotherapy.

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