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Project acronym: CAPOSTROMEXTopics: cancer stem cells, epithelial breast tumor, stroma physical properties, polarity genes, molecular pathwaysDisciplinary fields :&#160;cancerology, cell biology, biophysics, microscopySummary: It is known that stroma of solid tumor is typically stiffer than normal, which is the root of basic physical tumor detection. Recently, a stiffer tumor microenvironment has been linked to tumor progression, yet a relationship betweenepithelial tumor heterogeneity and stroma local physical properties have not been established. This interdisciplinary project aims, at first, describing the relationship between epithelial breast tumor heterogeneity, &#160;cancer stem cell (CSC) behavior and stroma physical properties in patients by state of the art physical and imaging technologies to provide models to be tested in vivo (PDX and tumors in mouse) and in vitro (in tumoroids and tumors cells). The &#160;first proposition is to manipulate the rigidity of the stroma matrix locally or globally. Then, an evaluation of the impact of such variations on tumor growth, dissemination and migration and on CSC gene expression profile will be done, in order to refine the models. Finally, the models will be implemented &#160;by manipulating the expression of polarity genes (apico-basal and planar polarity) and newly identified genes from CSC reacting to stroma physical changes to define molecular pathways that impact tumor growth and dissemination.Project interlocutor: Dominique Massey-Harroche, IDBM (UMR 7288)Project duration: 04/01/2018 - 03/31/2021Call for application: Interdisciplinarité 2016Photography credits: Sharon McCutcheon on Unsplash, License