title: Definition of a new entity of malignant extragonadal germ cell tumors.
abstract: Two malignant extragonadal germ cell tumors are reported, histologically classified as immature teratomas, having pseudodiploid karyotypes with complex structural rearrangements but lacking isochromosome 12p or other rearrangements involving 12p. The absence of 12p material in structural rearrangements was confirmed by chromosome painting. In the two tumors the following common chromosomal breakpoints were found: 6p21, 6p22, 6q23, and 11q13. Exactly the same chromosomal regions, 6p22::6q23 and 6p21::11q13, were involved in fusions. The two tumors belong to a new entity of extragonadal immature teratomas of adults which may be located in the retroperitoneum and posterior mediastinum and are prone to blood borne metastasis.
authors.affiliation: Department of Medical Genetics, University of Groningen, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: van Echten
authors.forename: B
authors.initials: B
authors.lastname: de Jong
authors.forename: R J
authors.initials: RJ
authors.lastname: Sinke
authors.forename: D O
authors.initials: DO
authors.lastname: Weghuis
authors.forename: D T
authors.initials: DT
authors.lastname: Sleijfer
authors.forename: J W
authors.initials: JW
authors.lastname: Oosterhuis
mesh_terms: D000328:Adult; D000368:Aged; D002869:Chromosome Aberrations; D002880:Chromosomes, Human, Pair 11; D002896:Chromosomes, Human, Pair 6; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D008297:Male; D008479:Mediastinal Neoplasms / Q000235:genetics*; D012983:Soft Tissue Neoplasms / Q000235:genetics*; D013724:Teratoma / Q000235:genetics*