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. 1994 Aug;145(2):268–275.

CD5 expression in thymic carcinoma.

T Hishima 1, M Fukayama 1, M Fujisawa 1, Y Hayashi 1, K Arai 1, N Funata 1, M Koike 1
PMCID: PMC1887382  PMID: 7519823

Abstract

To determine the differences between the cellular characteristics of thymic carcinoma and thymoma, immunohistochemical analysis with lymphocyte markers (CD1a, 3, 4, 5, 8, 10, 20, 21, 25, 30, 57, and 72) was performed on 23 thymic epithelial tumors other than lymphocytic thymoma: overt thymic carcinoma (OC, n = 7), atypical thymoma (n = 5), and typical thymoma (epithelial or mixed thymoma, n = 11). Among the surface antigens examined, CD5, a type of receptor molecule that signals cell growth in T cells, was expressed in neoplastic epithelial cells of the thymus, in OC (seven of seven) and atypical thymoma (two of five), but not in typical thymoma. Double labeling immunofluorescence demonstrated expression of CD5 in cytokeratin-positive cells. The CD5 molecule extracted from an OC tumor showed the same molecular size as that in the spleen, but CD72, a ligand of CD5 on the surface of B cells, was not found in the epithelial cells of OC or atypical thymoma. Expression of CD5 was not observed in carcinomas of other organs, such as lung (n = 15), breast (n = 4), esophagus (n = 6), stomach (n = 6), colon (n = 9), and uterine cervix (n = 3). CD5 is closely related to morphological changes in thymic epithelial tumors and may play a role in the evolution of OC through receptor-ligand interaction.

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Selected References

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