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Oncology - Surgery


Bioluminescent Orthotopic Mouse Models of Human Localized Non-Small Cell Lung Cancer: Feasibility and Identification of Circulating Tumour Cells
Published: Tuesday, October 11, 2011
Author: Pierre Mordant et al.

by Pierre Mordant, Yohann Loriot, Benoit Lahon, Yves Castier, Guy Les├Ęche, Jean-Charles Soria, Marie-Catherine Vozenin, Charles Decraene, Eric Deutsch

Background

Preclinical models of non-small cell lung cancer (NSCLC) require better clinical relevance to study disease mechanisms and innovative therapeutics. We sought to compare and refine bioluminescent orthotopic mouse models of human localized NSCLC.

Methods

Athymic nude mice underwent subcutaneous injection (group 1-SC, n?=?15, control), percutaneous orthotopic injection (group 2-POI, n?=?30), surgical orthotopic implantation of subcutaneously grown tumours (group 3-SOI, n?=?25), or transpleural orthotopic injection (group 4-TOI, n?=?30) of A549-luciferase cells. Bioluminescent in vivo imaging was then performed weekly. Circulating tumour cells (CTCs) were searched using Cellsearch® system in SC and TOI models.

Results

Group 2-POI was associated with unexpected direct pleural spreading of the cellular solution in 53% of the cases, forbidding further evaluation of any localized lung tumour. Group 3-SOI was characterized by high perioperative mortality, initially localized lung tumours, and local evolution. Group 4-TOI was associated with low perioperative mortality, initially localized lung tumours, loco regional extension, and distant metastasis. CTCs were detected in 83% of nude mice bearing subcutaneous or orthotopic NSCLC tumours.

Conclusions

Transpleural orthotopic injection of A549-luc cells in nude mouse lung induces localized tumour, followed by lymphatic extension and specific mortality, and allowed the first time identification of CTCs in a NSCLC mice model.

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