The incidence of testicular neoplasia has increased, and its early detection has become a pressing clinical issue. The strong association between male subfertility and risk of testicular neoplasia is consistent with the existence of common pathogenetic factors. Most forms of testicular germ tumors are believed to stem from a common precursor, intratubular germ cell neoplasia (ITGCN), also known as testicular carcinoma in situ. Identification of ITGCN cells in testicular biopsies, however, is a diagnostic challenge and markers are sorely needed to assist in the accurate identification of the lesion.
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Compared to the WHO classification of the male genital tumors in 2016, minimal changes were introduced in the current WHO 2022. Classification of germ cell tumors remains the same as in the previous edition, dividing germ cell tumors into those derived from germ cell neoplasia in situ (GCNIS) and those independent of GCNIS. The group of GCNIS derived germ cell tumors is essentially unchanged.
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