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Genetic abnormalities in men with germ cell tumors
F H Dexeus1, C J Logothetis, C Chong
1Department of Medical Oncology, University of Texas M. D. Anderson Hospital and Tumor Institute, Houston 77030.
Abstract:
We retrospectively reviewed the genetic abnormalities detected clinically in 455 men with advanced germ cell tumors referred for chemotherapy. Of the patients 49 had extragonadal and 406 had testicular germ cell tumors. Of 19 patients with mediastinal germ cell tumors 4 (21 per cent, 3 with teratocarcinoma and 1 with endodermal sinus tumor) had Klinefelter's syndrome. Three of these patients had a 47XXY and 1 had a 48XXYY karyotype. No Klinefelter's syndrome was observed among 30 consecutive patients with retroperitoneal germ cell tumors or among the 406 with testicular tumors. Karyotypes of 35 consecutive patients with testis cancer without evident congenital abnormalities showed normal chromosomal patterns. We found 2 patients with Down's syndrome and testicular tumor, for an incidence of 0.5 per cent (probably significant). We also describe 2 cases of nonseminomatous testicular cancer and Marfan's syndrome (0.5 per cent incidence versus a 5 of 100,000 incidence of Marfan's syndrome in the general population). Apparently, genetic abnormalities are increased in men with germ cell tumors and we discuss the significance of this association.
Insights
Genetic abnormalities are more common in men with germ cell tumors. Klinefelter's syndrome was found in 21% of mediastinal germ cell tumor patients, and Down's syndrome and Marfan syndrome were also observed.
Area of Science:
- Oncology
- Genetics
- Urology
Background:
- Germ cell tumors (GCTs) are the most common solid tumors in young men.
- Genetic abnormalities may play a role in GCT development.
- Previous studies have suggested an association between GCTs and certain genetic conditions.
Purpose of the Study:
- To investigate the prevalence of genetic abnormalities in men with advanced germ cell tumors.
- To determine if specific genetic syndromes are associated with GCTs.
Main Methods:
- Retrospective review of clinical genetic data from 455 men with advanced GCTs.
- Analysis of tumor type (testicular, extragonadal) and location.
- Karyotyping for patients with suspected chromosomal abnormalities.
Main Results:
- Klinefelter's syndrome (47XXY or 48XXYY) was identified in 4 of 19 patients (21%) with mediastinal GCTs.
- No Klinefelter's syndrome was observed in patients with retroperitoneal or testicular GCTs.
- Two patients (0.5%) with testicular tumors had Down's syndrome, and two patients (0.5%) had Marfan syndrome.
Conclusions:
- Genetic abnormalities appear to be increased in men with germ cell tumors.
- Specific genetic syndromes, such as Klinefelter's, Down's, and Marfan syndrome, may be associated with GCTs.
- Further research is warranted to understand the significance of these associations.