Successful cytogenetic analysis was performed on short-term cultures o
f 62 malignant ovarian tumors from 42 patients. Twenty-three tumors fr
om 18 patients revealed clonal chromosome abnormalities. Five cases sh
owed nonclonal chromosome changes. In the remaining 19 cases, a normal
female karyotype was found. Numerical or single structural changes we
re found in only 11 carcinomas from nine patients. Trisomy 12 and 7 we
re each the sole abnormality in two cases a piece. One tumor showed a
trisomy 6 as the only karyotypic change. Four tumors revealed simple t
ranslocations and deletions affecting the chromosomes X, 1, 2, 6, and
7. Twelve of the cytogenetically abnormal tumor samples showed complex
karyotypes with both numerical and structural aberrations leading to
hyperdiploid, near-triploid, and near-tetraploid stemlines. The recurr
ent numerical imbalances were losses of the chromosomes 1 (N = 5), X (
N = 3), and 17 (N = 3), and gains of the chromosomes 12 (N = 5) and 20
(N = 3). Regarding structural rearrangements, the chromosome bands 11
p13-14 and 19p13 were the most frequently affected regions. 11p13-14 w
as rearranged in four tumors. In two cases, a deletion 11p13-14 was fo
und. Two tumors revealed a nonreciprocal translocation involving 11p13
-14 and leading to the loss of distal 11p material. The most consisten
t finding was a 19p + marker chromosome, which was present in five dif
ferent ovarian carcinomas. Our results are in accordance with a recent
cytogenetic report describing a 19p + marker and loss of 11p material
as consistent cytogenetic aberrations in human ovarian carcinomas.