Primary squamous cell carcinoma of the breast: report of two cases with HER2 overexpression.
Cancer Biol Ther
; 21(12): 1081-1086, 2020 12 01.
Article
in En
| MEDLINE
| ID: mdl-33180662
ABSTRACT
OBJECTIVE:
To investigate the clinicopathologic features and immunophenotype of primary squamous cell carcinoma of the breast (PSCCB) with HER2 overexpression. Methods Two cases of PSCCB with HER2 overexpression were retrospectively reviewed, and the pathological features, immunophenotype and prognosis were discussed. Results The tumor showed malignant squamous cells arranged in sheets, groups and nests, forming keratin-pearl and intercellular bridges. Immunohistochemical (IHC) analysis showed that the tumor cells were positive for 34ßE12, p63, CK5/6, E-cadherin and P120, while negative for ER and PR. Furthermore, HER2 overexpression showed strong continuous expression in cell membrane with a score of 3+ by IHC, or amplification by FISH. Conclusions PSCCB is a rare tumor in breast cancer and HER2 overexpression is rather unusual in PSCCB. The diagnosis mainly depends on the clinicopathologic features together with the immunophenotype. HER2 positive indicates poor prognosis. However, targeted therapy for HER2 may be a new hope for patients.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Breast Neoplasms
/
Carcinoma, Squamous Cell
/
Receptor, ErbB-2
Type of study:
Observational_studies
/
Prognostic_studies
Limits:
Adult
/
Female
/
Humans
/
Middle aged
Language:
En
Journal:
Cancer Biol Ther
Journal subject:
NEOPLASIAS
/
TERAPEUTICA
Year:
2020
Document type:
Article
Affiliation country:
China