Understanding Healthy Cells That Mimic Breast Cancer: What Women Need to Know

A study from The University of Texas MD Anderson Cancer Center reveals that some normal breast cells in healthy women may have chromosome abnormalities linked to invasive breast cancer. This study challenges the idea of what “normal” breast tissue is and may change how we detect cancer early.

Published in Nature, the research indicates that at least 3% of normal breast cells from 49 healthy women show aneuploidy, which is the gain or loss of chromosomes. This condition increases with age. Principal investigator Nicholas Navin, Ph.D., says this finding raises questions about normal tissue and cancer origins.

As researchers look for better ways to detect cancer using molecular diagnostics, this study warns of potential false positives. These abnormal cells might be mistaken for invasive breast cancer. Navin notes that every healthy woman studied showed irregularities in their breast cells, suggesting a need to rethink when cancer develops.

The research builds on Navin’s earlier work that mapped normal breast tissue at the cellular level. In this study, samples were taken from healthy women undergoing breast reduction surgery. Researchers analyzed chromosomal changes in normal breast tissues in comparison to established breast cancer data.

Using advanced techniques, researchers focused on breast epithelial cells, which are known to potentially develop into cancer. They found the most common changes involved extra copies of chromosome 1q and losses of chromosomes 10q, 16q, and 22. These changes are often seen in invasive breast cancers.

The findings indicate that these abnormal cells belong to both known lineages of mammary gland cells. One lineage has features similar to estrogen receptor-positive breast cancer, while the other resembles estrogen receptor-negative breast cancer, suggesting different origins for each.

Navin emphasizes the rarity of these abnormal cells in healthy individuals and mentions the need for more studies to understand if these cells can become cancerous. He also highlights that similar cells exist in other body systems, potentially impacting cancer research beyond breast cancer.

“The presence of these cells reveals the imperfections in our bodies over time,” Navin states. “This research has significant implications for understanding various cancer types.”

Funding for this study came from several organizations, including the National Cancer Institute and the American Cancer Society.