DNA Ploidy Pattern in Pure Seminomas

Zoltán SÁPI1, Jorgosz SZAPANIDISZ2, Bernadette TÓTH1, István BODROGI3

1Department of Pathology, St. John's Hospital, Budapest, Hungary
2Department of Urology, St. John's Hospital, Budapest, Hungary
3Department of Chemotherapy and Clinicopharmacology, National Institute of Oncology, Budapest, Hungary


Nuclear extract and image cytometry was used to determine the DNA ploidy pattern of 31 pure seminomas. At least 5-year but usually 10-year follow-up was available to compare the clinical outcome to the DNA ploidy pattern. In 24 cases (77.4%) the DNA indexes (DI) showed tetraploid (1,8 < DI < 2,2) pattern confirming the recent cytogenetic and flow cytometric DNA studies of others. However, in 7 cases (22,6%) the tumors were aneuploid. Out of these aneuploid cases 2 had two subpopulations and 2 had less than 1,8 DI. These latter cases (providing the loss of chromosomal DNA) had elevated AFP levels in serum that raises the question of nonseminomatous transformation without any morphological evidence. Usually, the aneuploid cases had worse prognoses but there was no significant difference. Because of the small number of aneuploid cases wider clinicopathologic studies are required to confirm our results. Pathology & Oncology Research, Vol 1, Nr 1, 71-74, 1995

Key words: DNA ploidy; image cytometry; seminoma

Received: May 2, 1995; accepted: Jun 12, 1995
Correspondence: Zoltán SÁPI, Department of Pathology, St. John's Hospital, Diósárok u. 1. Budapest H-1122, Hungary

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