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In a study involving a large series of epithelial ovarian carcinomas (EOCs), McCaughan et al1 reported human epidermal growth factor receptor 2 (HER2) protein overexpression and amplification in all major histological subtypes, an observation consistent with the literature.2 3 Specifically, they document HER2 gene amplification in 3.0% (7/259) of serous papillary carcinomas, 2.1% (2/92) of endometrioid carcinomas, 25.0% (3/12) of mucinous carcinomas, 4.0% (1/25) of clear cell carcinomas and 11.9% (7/60) of mixed type carcinomas. Although their number of mucinous carcinomas was low (n=12), the higher prevalence of HER2 gene amplification relative to the other histological subtypes is also consistent with the literature.4 5
We had previously reported similar findings of primary ovarian mucinous carcinomas having the highest prevalence of HER2 …
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Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.