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Comparative Study
Journal Article
A comparative morphological and immunohistochemical study of testicular seminomas and intracranial germinomas.
Histopathology 1990 November
A series of 10 classical testicular seminomas and 10 intracranial germinomas were reviewed and examined using immunohistochemical techniques. In particular, the staining profiles of the tumour cells and the nature of the mononuclear cell infiltrate at the two sites were studied and compared. The tumour cells in eight of the 10 intracranial germinomas and nine of the 10 seminomas exhibited positive staining with placental alkaline phosphatase. Only one intracranial germinoma showed evidence of human chorionic gonadotrophin expression. Tumour cells in all cases at both sites were negative for cytokeratin and vimentin. The lymphocytic infiltrate in both the testicular and intracranial tumours was similar, comprising T-cells and B-cells, the former predominantly. The presence of macrophages and granulomas in tumours at both sites was noted. These findings confirm the high degree of similarity of germinomas of intracranial and testicular origin, and support the hypothesis of a common derivation. We could find no evidence of differentiation of tumour cells at either site.
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