Scientists find breast cancer cells hiding behind protective “shields”

Researchers from the MRC Laboratory of Medical Sciences (LMS), Imperial College London, and UCL Genetics Institute have published findings in Genome Medicine that detail the cellular architecture of breast tumors. The study identifies distinct regions within tumors, highlighting pockets of dormant cancer cells that can survive treatment and potentially lead to cancer recurrence.

These dormant cells, referred to as 'quiescent' cells, are often found surrounded by immune and connective tissue cells, which may act as a protective shield against chemotherapy. Dr. Alexis Barr, co-lead author of the study, emphasized the danger posed by these quiescent cells, stating that they can remain inactive until conditions become favorable for reactivation, potentially leading to tumor proliferation after treatment has concluded.

The research utilized single-cell RNA sequencing to create detailed maps of breast cancer tumors, revealing the complex interplay between actively dividing cancer cells and their dormant counterparts. The findings suggest that future cancer therapies should not only focus on targeting rapidly growing tumor cells but also address the dormant cells and their surrounding environments to improve long-term treatment outcomes.