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The immunohistochemical expression pattern of Chk2, p53, p19INK4d, MAGE‐A4 and other selected antigens provides new evidence for the premeiotic origin of spermatocytic seminoma

Aims:  Spermatocytic seminoma is a rare germ cell derived tumour of the testis that occurs mainly in older men. We analysed the expression of recently discovered markers for germ cell differentiation and the mitosis–meiosis transition in order to define the antigen profile for diagnostic purposes and to clarify the biology and histogenesis of spermatocytic seminoma.