Mr. Jianan Chen Profile

Jianan Chen

at Sunnybrook Research Institute

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Proceedings Article | 7 April 2023 Poster + Paper

Integrated image-processing and transcriptomic analysis of cancer-associated fibroblasts (CAFs) in breast cancer subtypes

Alison Cheung, Hassan Besher, Dan Wang, Kela Liu, Yutaka Amemiya, Jianan Chen, Anne Martel, Arun Seth, Martin Yaffe

Proceedings Volume 12471, 124711F (2023) https://doi.org/10.1117/12.2653946

KEYWORDS: Breast cancer, Cancer, Proteins, Tumors, Multiplexing, Image analysis, Cell phenotyping, Tissues, Binary data

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The tumor microenvironment (TME) plays an important role in driving cancer progression and affecting treatment efficacy. Cellular components of the TME include various immune subsets (tumor infiltrating lymphocytes (TILs) and macrophages), cancer-associated fibroblasts (CAFs) and vascular cells. While immune lineage has been a main focus of intensive research on the TME, CAFs have also been shown to be highly heterogeneous in their molecular phenotype and function. Using a protein marker immunofluorescence multiplexing system (Cell DIVE, Leica Microsystems) and quantitative imaging tools, we investigated the identity of various CAF clusters based on the expression of α-Smooth Muscle Actin (αSMA) and Fibroblast Activation Protein (FAP), and compared their distributions across breast cancer subtypes. We determined the cell counts of various CAF subsets using binary counting and identified the heterogeneous presentations of clusters using K-means clustering and Uniform Manifold Approximation and Projection (UMAP). We found that the abundance of CAF clusters varied among breast cancer subtypes. An integrated analysis of CAF cluster composition in each cancer and the transcriptomic data of CAF-associated genes such as CD29, IL6 and PDGFRβ was performed. We observed increased densities of proliferative, αSMA-positive CAFs in basal-like breast cancers that exhibited a co-expression signature of CAF-associated genes. Finally, an association analysis of CAF cluster composition and gene expression with previously identified radiomic phenotype was performed, but significant correlation was not detected.

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