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The Tumor Microenvironment02:17

The Tumor Microenvironment

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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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Visualization, Quantification, and Mapping of Immune Cell Populations in the Tumor Microenvironment
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Single-cell and Spatial Transcriptomic Analyses Implicate Formation of the Immunosuppressive Microenvironment during

Fengfeng Cai1, YuanYuan Li2, Hui Liu2

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Breast cancer progression involves increasing tumor cell malignancy and immune cell exhaustion. This study reveals how tumor cells create an immunosuppressive microenvironment, impacting cancer development.

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Area of Science:

  • Oncology
  • Immunology
  • Genomics

Background:

  • Ductal carcinoma in situ (DCIS) and invasive ductal carcinoma (IDC) are key stages in breast cancer progression.
  • Genomic instability, marked by increased mutation and copy number variation rates, is a hallmark of tumor development.
  • Understanding cellular states and intercellular interactions during tumor progression is crucial for deciphering cancer evolution.

Purpose of the Study:

  • To investigate the evolutionary trajectory of tumor cells during breast cancer progression.
  • To elucidate the mechanisms establishing an immunosuppressive tumor microenvironment.
  • To analyze cellular and molecular changes from ductal carcinoma in situ to invasive ductal carcinoma.

Main Methods:

  • Exploratory analysis of single-cell sequencing data from 13 breast cancer samples (DCIS and IDC).
  • Utilized spatial transcriptomics to confirm cellular colocalization and molecular interactions.
  • Investigated gene expression patterns of tumor and immune cells.

Main Results:

  • Tumor cells exhibited increased malignancy and aggressiveness during progression from DCIS to IDC.
  • T cells transitioned to an exhausted phenotype, contributing to immune suppression.
  • Tumor cells expressed coinhibitory ligands, interacting with immune cell receptors to foster an immunosuppressive microenvironment.
  • Spatial transcriptomics validated the physical proximity of tumor and immune cells and the expression of key ligand-receptor pairs.

Conclusions:

  • Breast cancer progression is associated with escalating tumor cell malignancy and immune evasion.
  • The formation of an immunosuppressive tumor microenvironment is driven by specific tumor-immune cell interactions.
  • These findings offer insights into the cellular and molecular basis of immune suppression in breast cancer progression.