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Updated: Jul 20, 2026

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Time-lapse Imaging of Primary Preneoplastic Mammary Epithelial Cells Derived from Genetically Engineered Mouse Models of Breast Cancer
Published on: February 8, 2013
Preneoplastic lesions in the human breast
Summary
Atypical lobules, potential preneoplastic lesions, were found more often in human breasts with cancer. These findings suggest atypical lobules may indicate increased breast cancer risk.
Area of Science:
- Pathology
- Oncology
- Human Breast Tissue Analysis
Background:
- Atypical lobules are observed in human breast tissue.
- Understanding the role of atypical lobules in breast cancer development is crucial.
Purpose of the Study:
- To investigate the frequency of atypical lobules in cancer-associated versus routine autopsy human breast tissue.
- To explore the potential of atypical lobules as preneoplastic markers for breast cancer risk.
Main Methods:
- Subgross sampling technique with histological confirmation.
- Examination of 119 whole human breasts (cancer-associated and routine autopsy).
Main Results:
- Atypical lobules were significantly more frequent in the cancer-associated group.
- Atypical lobules exhibited a spectrum of anaplasia, bridging normal epithelium and carcinoma in situ.
- Atypical lobules may be analogous to hyperplastic alveolar nodules found in high mammary cancer mouse strains.
Conclusions:
- Atypical lobules are common preneoplastic lesions in the human mammary gland.
- Atypical lobules serve as potential markers for increased breast cancer risk.
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