A subset of cell clusters with malignant features in morphologically normal-appearing and hyperplastic tissues

Area of Science:

• Oncology
• Pathology
• Genetics

Background:

• Human breast cancer develops through sequential stages: normal, hyperplastic, in situ, invasive, and metastatic.
• Previous research identified malignancy-associated alterations in morphologically normal and hyperplastic breast tissues near tumors.

Purpose of the Study:

• To investigate early indicators of breast cancer progression in seemingly normal tissues.
• To explore the potential for improved early detection and diagnosis of breast lesions.

Main Methods:

• Immunohistochemical and cytological analysis of cell clusters in breast tissues.
• Comparison of altered cell clusters with morphologically similar counterparts within the same lesion.

Main Results:

• Identified cell clusters with disrupted myoepithelial layers and loss of estrogen receptor expression.
• Observed stromal and vascular invasion, altered nuclear morphology, and expression of malignancy biomarkers in benign-appearing cells.
• Detected malignancy-associated nuclear changes in cells that appeared benign.

Conclusions:

• These findings suggest underlying DNA structural abnormalities or cancer susceptibility genes facilitating tumor progression.
• Breast tumor progression may not always follow the hypothesized linear sequence.
• Integrated immunohistochemical and cytological assessment can aid in differential diagnosis, early detection, and prevention of malignant breast lesions.