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Primary soft tissue sarcoma and its local recurrence: genetic changes studied by comparative genomic hybridization
P Popov1, M Virolainen, E Tukiainen
1Department of Plastic Surgery, Töölö Hospital, Helsinki University Central Hospital, Finland.
Summary
Genetic aberrations increase in soft-tissue sarcomas upon recurrence, indicating tumor progression. Local recurrences show more copy number changes and high-level amplifications than primary tumors.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Soft-tissue sarcomas are a heterogeneous group of cancers.
- Understanding genetic changes during tumor progression is crucial for effective treatment.
Purpose of the Study:
- To compare genetic aberrations between primary soft-tissue sarcomas and their local recurrences.
- To identify genetic alterations associated with tumor progression in soft-tissue sarcomas.
Main Methods:
- Comparative genomic hybridization (CGH) was used to analyze 20 primary soft-tissue sarcoma and local recurrence tumor pairs.
- Samples were collected before any radio- or chemotherapy treatment.
Main Results:
- Copy number aberrations were found in 50% of primary tumors and 70% of local recurrences.
- The mean number of genetic changes significantly increased from primary tumors (2.45) to local recurrences (5.05).
- Specific genetic alterations, including loss at 9p and gains at 5p and 20q, were more frequent in local recurrences.
Conclusions:
- Tumor progression in soft-tissue sarcomas is associated with an increased number of genetic aberrations.
- Certain genetic changes, such as 9p loss and 5p/20q gains, may play a role in the progression of soft-tissue sarcomas.
- High-level amplification of 18p11.3 was observed in recurrences but not in primary tumors.