Tags

Type your tag names separated by a space and hit enter

Metaplastic breast carcinoma: clinical-pathologic characteristics and HER2/neu expression.
Breast Cancer Res Treat. 2005 May; 91(2):173-8.BC

Abstract

BACKGROUND

Metaplastic breast carcinomas (MBC) are rare primary breast malignancies characterized by the co-existence of carcinoma with non-epithelial cellular elements. They can be classified as monophasic spindle cell (sarcomatoid) carcinoma, biphasic carcinosarcoma, adenocarcinoma with divergent stromal differentiation (osseous, chondroid and rarely rhabdoid) as well as adenosquamous and pure squamous cell carcinomas. There is a paucity of information on clinically relevant pathologic features and clinical outcomes for these rare tumors. The aim of this study was to review the pathologic features and clinical outcomes of all cases of MBC seen at a single institution between 1971 and 2000.

METHODS

A computerized search of the Queen Elizabeth II Health Sciences Center (QEII HSC) surgical pathology files was performed for the years 1971-2000. Tumor blocks from identified cases were reviewed and immunohistochemistry was performed for estrogen and progesterone receptors (ER/PR), HER2/neu protein overexpression and cytokeratin profile. Clinical outcome information was obtained from hospital files and telephone contact with treating physicians.

RESULTS

Twenty-six (26) cases were retrieved with only one case identified before 1990. All tumors were high grade with a median tumor size of 3.7 cm (range 1.4-9.5 cm). Thirteen cases had lymph node dissections available for evaluation, with 4 demonstrating nodal metastases. Five of 26 cases were ER positive within the adenocarcinomatous component, only two of which also expressed PR. Associated ductal carcinoma in situ (DCIS) was present in 11 cases. HER2/neu over-expression was seen in only one (1/26) adenosquamous carcinoma (3 + membranous staining of the malignant glandular component). At 23 months median follow-up, disease free survival (DFS) for the entire group was 53%.

CONCLUSIONS

Although a rare breast cancer subtype, MBC is of considerable interest due to its pathological heterogeneity and differences in clinical behavior compared to typical breast carcinomas. Increasing pathologic recognition of MBC as a discrete entity is suggested by the number of MBC diagnoses in the last decade compared to previous years. The poor DFS associated with MBC suggests that further research exploring mechanisms of carcinogenesis and identifying clinically relevant prognostic factors is needed to direct optimum clinical care. Importantly, MBC variants appear to rarely overexpress the HER2/neu oncoprotein.

Authors+Show Affiliations

Department of Pathology, Queen Elizabeth II Health Sciences Centre, Halifax, Nova Scotia B3H 2Y9, Canada.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

15868445

Citation

Barnes, P J., et al. "Metaplastic Breast Carcinoma: Clinical-pathologic Characteristics and HER2/neu Expression." Breast Cancer Research and Treatment, vol. 91, no. 2, 2005, pp. 173-8.
Barnes PJ, Boutilier R, Chiasson D, et al. Metaplastic breast carcinoma: clinical-pathologic characteristics and HER2/neu expression. Breast Cancer Res Treat. 2005;91(2):173-8.
Barnes, P. J., Boutilier, R., Chiasson, D., & Rayson, D. (2005). Metaplastic breast carcinoma: clinical-pathologic characteristics and HER2/neu expression. Breast Cancer Research and Treatment, 91(2), 173-8.
Barnes PJ, et al. Metaplastic Breast Carcinoma: Clinical-pathologic Characteristics and HER2/neu Expression. Breast Cancer Res Treat. 2005;91(2):173-8. PubMed PMID: 15868445.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Metaplastic breast carcinoma: clinical-pathologic characteristics and HER2/neu expression. AU - Barnes,P J, AU - Boutilier,R, AU - Chiasson,D, AU - Rayson,D, PY - 2005/5/4/pubmed PY - 2005/7/26/medline PY - 2005/5/4/entrez SP - 173 EP - 8 JF - Breast cancer research and treatment JO - Breast Cancer Res Treat VL - 91 IS - 2 N2 - BACKGROUND: Metaplastic breast carcinomas (MBC) are rare primary breast malignancies characterized by the co-existence of carcinoma with non-epithelial cellular elements. They can be classified as monophasic spindle cell (sarcomatoid) carcinoma, biphasic carcinosarcoma, adenocarcinoma with divergent stromal differentiation (osseous, chondroid and rarely rhabdoid) as well as adenosquamous and pure squamous cell carcinomas. There is a paucity of information on clinically relevant pathologic features and clinical outcomes for these rare tumors. The aim of this study was to review the pathologic features and clinical outcomes of all cases of MBC seen at a single institution between 1971 and 2000. METHODS: A computerized search of the Queen Elizabeth II Health Sciences Center (QEII HSC) surgical pathology files was performed for the years 1971-2000. Tumor blocks from identified cases were reviewed and immunohistochemistry was performed for estrogen and progesterone receptors (ER/PR), HER2/neu protein overexpression and cytokeratin profile. Clinical outcome information was obtained from hospital files and telephone contact with treating physicians. RESULTS: Twenty-six (26) cases were retrieved with only one case identified before 1990. All tumors were high grade with a median tumor size of 3.7 cm (range 1.4-9.5 cm). Thirteen cases had lymph node dissections available for evaluation, with 4 demonstrating nodal metastases. Five of 26 cases were ER positive within the adenocarcinomatous component, only two of which also expressed PR. Associated ductal carcinoma in situ (DCIS) was present in 11 cases. HER2/neu over-expression was seen in only one (1/26) adenosquamous carcinoma (3 + membranous staining of the malignant glandular component). At 23 months median follow-up, disease free survival (DFS) for the entire group was 53%. CONCLUSIONS: Although a rare breast cancer subtype, MBC is of considerable interest due to its pathological heterogeneity and differences in clinical behavior compared to typical breast carcinomas. Increasing pathologic recognition of MBC as a discrete entity is suggested by the number of MBC diagnoses in the last decade compared to previous years. The poor DFS associated with MBC suggests that further research exploring mechanisms of carcinogenesis and identifying clinically relevant prognostic factors is needed to direct optimum clinical care. Importantly, MBC variants appear to rarely overexpress the HER2/neu oncoprotein. SN - 0167-6806 UR - https://www.unboundmedicine.com/medline/citation/15868445/Metaplastic_breast_carcinoma:_clinical_pathologic_characteristics_and_HER2/neu_expression_ L2 - https://doi.org/10.1007/s10549-004-7260-y DB - PRIME DP - Unbound Medicine ER -