Evaluation of preclinical efficacy of everolimus and pasireotide in thyroid cancer cell lines and xenograft models

PloS One
Taofeek K OwonikokoShi-Yong Sun

Abstract

Signaling through mTOR and somatostatin pathway is implicated in thyroid cancer development. We evaluated everolimus, an mTOR inhibitor and pasireotide, a multi receptor somatostatin analogue as potential therapy of thyroid cancer focusing on the in vitro and in vivo efficacy, as well as possible mechanism to explain any observed interaction. Both everolimus and pasireotide inhibit the growth of thyroid cancer cell lines in vitro with varied efficacy that correlates with tumor origin and somatostatin receptor (SSTR) expression profile of the cell lines. In vitro activity of everolimus show positive correlation with the expression of SSTR types 1, 4 and 5 (CC: 0.9; 0.85, 0.87) while pasireotide activity show negative correlation with SSTR2 (CC: -0.87). Although there is greater modulation of pS6 when pasireotide is combined with everolimus, there is no significant abrogation of the expected feedback upregulation of AKT induced by everolimus. Also, the combination is not significantly better than each agent alone in short and long term in vitro assays. Continuous administration of everolimus at a low dose as opposed to high intermittent dosing schedule has greater antitumor efficacy against thyroid cancer xenografts in vivo. Pasi...Continue Reading

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Citations

Dec 10, 2020·Thyroid Research·Simone De LeoLaura Fugazzola

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Methods Mentioned

BETA
xenograft
xenografts
Fluorescence

Software Mentioned

GraphPad prism

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