Abstract
How invasive testicular germ cell tumours (TGCTs) develop from precursor carcinoma in situ/intratubular germ cell neoplasia unclassified (CIS/IGCNU) cells, and only after puberty, is unknown. In the current issue of The Journal of Pathology, Jørgensen and colleagues have compared the protein expression profile of CIS before and after puberty and in pre-invasive versus invasive TGCT and show that the mitosis-meiosis controller DMRT1 switches off in CIS cells postpubertally and is associated with invasiveness. They also show that CIS cells express a 'confusing' mix of pro- and anti-meiotic proteins; this may predispose CIS cells to accumulate extra chromosomal material which ultimately leads to tumourigenesis.
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