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Multifocality in "basal-like" breast carcinomas and its influence on lymph node status
1Department of Pathology and Clinical Cytology, Central Hospital Falun, Falun, Sweden. tibor.tot@ltdalarna.se
Annals of Surgical Oncology
|December 17, 2010
Summary
Basal-like breast carcinomas are frequently multifocal, similar to other breast cancer types. Multifocality in any breast cancer subtype increases the risk of vascular invasion and lymph node metastasis.
Area of Science:
- Oncology
- Pathology
- Breast Cancer Research
Background:
- Basal-like breast carcinomas are often solitary with poor prognosis.
- Many breast carcinomas are multifocal with higher metastatic potential.
- Understanding lesion distribution is crucial for prognosis.
Purpose of the Study:
- Analyze subgross lesion distribution in basal-like carcinomas.
- Compare distribution with non-basal-like tumors.
- Assess vascular invasion and lymph node metastasis in relation to focality.
Main Methods:
- Studied 511 cases using large-format histologic sections.
- Defined basal-like tumors by myoepithelial marker expression (CK5/6, CK14, EGFR).
- Analyzed triple-negative basal-like carcinomas and assessed lesion distribution, vascular invasion, and lymph node metastasis.
Main Results:
- 44% of invasive components were multifocal/diffuse; 61% including in situ components.
- Basal-like tumors less frequently had in situ components (21% vs. 9%).
- Multifocality significantly increased lymph node metastasis risk in both basal-like and non-basal-like tumors.
Conclusions:
- Basal-like breast carcinomas exhibit multifocality as frequently as non-basal-like types.
- Multifocality is linked to a higher risk of vascular invasion and lymph node metastasis.
- Findings emphasize the prognostic importance of tumor focality across breast cancer subtypes.