Fibrolamellar carcinomas are positive for CD68

Hillary M. Ross, Hubert D.J. Daniel, Perumal Vivekanandan, Rajesh Kannangai, Matthew M. Yeh, Tsung Teh Wu, Hala R. Makhlouf, Michael Torbenson

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Abstract

Fibrolamellar carcinomas are a unique type of liver carcinoma that arise in non-cirrhotic livers of young individuals. Despite their distinctive appearance, recent studies have demonstrated a lack of consistency in how fibrolamellar carcinomas are diagnosed by pathologists. As a potential aide in diagnosis, we investigated the staining properties of CD68. The CD68 gene encodes for a transmembrane glycoprotein located within lysosomes and endosomes. Macrophages as well as other cell types rich in lysosomes/endosomes are CD68 positive. Cases of fibrolamellar carcinoma were collected from four academic centers. Control groups included hepatocellular carcinomas arising in both non-cirrhotic livers and cirrhotic livers. A group of cholangiocarcinomas were also stained. CD68 immunostaining was scored for both intensity and distribution on a scale of 0 to 3. Twenty-three primary fibrolamellar carcinomas and 9 metastases (total of 24 individuals) were immunostained and showed a distinctive granular, dot-like or stippled pattern of cytoplasmic staining in nearly all cases (31/32), with a median distribution and intensity score of 3. In control hepatocellular carcinomas that arose in non-cirrhotic livers, 10/39 showed CD68 staining with a median distribution and intensity score of 2. In hepatocellular carcinomas arising in cirrhotic livers, 3/27 cases showed CD68 positivity, all with stippled dot-like cytoplasmic staining similar to that of fibrolamellar carcinomas. All five cholangiocarcinomas were negative. Overall, CD68 positivity was strongly associated with fibrolamellar carcinomas, P0.001 and had a sensitivity of 96%, a specificity of 80%, and a negative predictive value of 98%. In sum, tumor positivity for CD68 staining was highly sensitive for fibrolamellar carcinoma and a lack of CD68 staining should suggest caution in making a diagnosis of fibrolamellar carcinoma.

Original languageEnglish (US)
Pages (from-to)390-395
Number of pages6
JournalModern Pathology
Volume24
Issue number3
DOIs
StatePublished - Mar 1 2011

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Keywords

  • CD68
  • cholangiocarcinoma
  • fibrolamellar carcinoma
  • hepatocellular carcinoma

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

Ross, H. M., Daniel, H. D. J., Vivekanandan, P., Kannangai, R., Yeh, M. M., Wu, T. T., Makhlouf, H. R., & Torbenson, M. (2011). Fibrolamellar carcinomas are positive for CD68. Modern Pathology, 24(3), 390-395. https://doi.org/10.1038/modpathol.2010.207