Comparative Use of Napsin A and Glypican 3 to Distinguish Endometrial Clear Cell from Serous and Endometrioid Carcinomas

Eirwen M. Miller, Joan Tymon-Rosario, Jaya Sunkara, Bryan E. Harmon, Rouzan G. Karabakhtsian, Akiva P. Novetsky

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2 Scopus citations

Abstract

Diagnosis of endometrial clear cell carcinomas is difficult owing to the low reproducibility of histological cell type in high-grade endometrial cancers. Recently, immunoreactivity for napsin A and glypican 3 has been reported in clear cell cancers. We sought to evaluate the use of napsin A and glypican 3 staining to distinguish clear cell carcinoma from other high-grade endometrial cancers. Methods/Materials Twenty cases of pure and mixed endometrial clear cell carcinoma were extracted from the 2000-2014 archival material in the Departments of Obstetrics & Gynecology and Pathology at Montefiore Medical Center and compared to serous and grade 3 endometrioid controls. Representative sections were stained with monoclonal antibodies to napsin A and glypican 3. Immunostains were independently reviewed by 2 pathologists to assess frequency and pattern of staining. Charts were reviewed for clinicopathologic and treatment data. Results Granular cytoplasmic positivity for napsin A was observed in 70% of endometrial clear cell carcinomas; only 25% showed cytoplasmic or membranous glypican 3 positivity. No serous or high-grade endometrioid tumors stained for either marker. No cases of clear cell carcinoma that stained negative for napsin A stained positive for glypican 3. No difference in the immunohistochemical profile was found between pure and mixed clear cell carcinomas and between early- and advanced-stage clear cell carcinomas. Conclusions Napsin A is a more sensitive marker for endometrial clear cell carcinoma than glypican 3. In histologically ambiguous cases, napsin A and glypican 3 may help distinguish clear cell carcinoma from other high-grade histologies. Further investigation of endometrial clear cell carcinoma is needed to identify additional diagnostic tools for this rare histology. Correlation of a unique immunohistochemical profile and clinical outcomes is necessary.

Original languageEnglish (US)
Pages (from-to)1318-1324
Number of pages7
JournalInternational Journal of Gynecological Cancer
Volume28
Issue number7
DOIs
Publication statusPublished - Sep 1 2018

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Keywords

  • Clear cell carcinoma
  • Glypican 3
  • High-grade endometrial cancer
  • Immunohistochemistry
  • Napsin A

ASJC Scopus subject areas

  • Oncology
  • Obstetrics and Gynecology

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