The transcriptional landscape of cancer stem-like cell functionality in breast cancer

Area of Science:

• Oncology
• Cancer Biology
• Immunology

Background:

• Cancer stem-like cells (CSCs) are implicated in breast cancer therapy resistance and relapse.
• Assessing CSCs in solid tumors is challenging due to a lack of specific markers and their phenotypic plasticity.
• The tumor microenvironment (TME) significantly influences CSC phenotype, driving resistance and metastasis.

Purpose of the Study:

• To investigate the relationship between CSC functionality and the tumor microenvironment (TME) in breast cancer.
• To identify molecular markers associated with CSC phenotype and prognostic value.

Main Methods:

• Utilized in vitro mammosphere formation assays.
• Performed bulk tumor microarray profiling.
• Applied deconvolution algorithms to analyze a cohort of 125 breast tumors.

Main Results:

• A significant association was found between the TME score and CSC functionality.
• CSC-rich tumors exhibited an immune-suppressed TME, contrasting with immune-infiltrated tumors lacking CSC potential.
• Gene expression analysis identified IFNG, CXCR5, CD40LG, TBX21, and IL2RG as associated with the CSC phenotype and patient prognosis.

Conclusions:

• Characterizing CSC content and functionality offers a strategy to refine breast cancer treatments.
• This approach can guide clinical decisions to enhance patient therapy response.
• Understanding the CSC-TME interplay is crucial for improving treatment outcomes.