We analyzed 3 cases of malignant ovarian germ cell tumors (MOGCTs), co
mprising 1 dysgerminoma and 2 immature teratomas, by banded chromosome
analysis and by in situ hybridization (ISH) using a chromosome 12p pa
inting probe. We found evidence of 12p abnormalities in two of them. A
possible common genetic pathway of origin of a subset of MOGCTs with
testicular germ cell tumors (TGCTs) is discussed.