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- W2054962012 abstract "Cancer-associated fibroblasts (CAFs) can promote breast cancer growth and metastasis, but the underlying mechanisms are still largely unknown. In order to study the role of CAFs in breast cancer development in an in vivo setting, we make use of a spontaneous mammary tumor mouse model for invasive lobular carcinoma (ILC). ILC is the second most common type of breast cancer, and is characterized by loss of E-cadherin, a rich stromal compartment, infiltrative growth, and treatment resistance. Often, the PI3K pathway is observed activated in the ILC subtype. Based on these characteristics, we have generated mouse models with mammary epithelial-specific conditional knockout of E-cadherin and PTEN that develop classical ILCs with a strong resemblance to human ILC. Using PDGFRβ as a fibroblast marker, we have observed an abundant presence of stromal fibroblasts in these ILCs, similar to human ILC. Based on a mammary gland transplantation setting using fluorescent labeled recipient mice, we have shown that fibroblasts get recruited from the host during tumor development. In vitro , we have also shown that tumor cells recruit fibroblasts. Inhibition of PDGFRβ in this in vitro model can at least in part inhibit this recruitment. We are currently investigating whether inhibition of PDGFRβ in vivo can prevent the recruitment of fibroblasts and subsequently tumor development or progression. In parallel, we have isolated fibroblasts from primary mouse ILCs and wild-type mammary glands to screen for other important players in the tumor-stroma crosstalk using RNA-seq and cytokine profiling. We will subsequently assess their functional significance during ILC development and progression. This research is supported by a fellowship of the Dutch Cancer Society Citation Format: Mirjam C. Boelens, Ellen Wientjens, Eva Schut, Sjoerd Klarenbeek, Karin E. de Visser, Jos Jonkers. The role of fibroblasts in invasive lobular breast carcinoma. [abstract]. In: Abstracts: AACR Special Conference on Cellular Heterogeneity in the Tumor Microenvironment; 2014 Feb 26-Mar 1; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2015;75(1 Suppl):Abstract nr B77. doi:10.1158/1538-7445.CHTME14-B77" @default.
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- W2054962012 date "2015-01-01" @default.
- W2054962012 modified "2023-10-02" @default.
- W2054962012 title "Abstract B77: The role of fibroblasts in invasive lobular breast carcinoma" @default.
- W2054962012 doi "https://doi.org/10.1158/1538-7445.chtme14-b77" @default.
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