A chromosome study of three ovarian tumors.

The cytogenetic results of three different types of malignant ovarian tumors are reported. Their chromosomes were studied indirectly by using either peritoneal washings or ascitic fluids. Detected in the peritoneal washings from a treated case of serous cystadenocarcinoma with papillary involvement, stage III, was a clone of pseudodiploid cells. They were found after 12 months of chemotherapy. No supporting evidence of malignancy was found cytologically. Relatively simple karyotypes were obtained from metaphases found in the ascitic fluid of a patient surgically treated for an immature teratoma, stage II, grade 3. Consistent abnormalities found were trisomy 2, del(3)(p14), and der(5)t(5;8)(q33;q11). Of prime interest in a case of dysgerminoma, stage IV, was the finding of the isochromosome i(12p), a recognized nonrandom abnormality of malignant testicular tumors [1-5].