Characterization of large chromosome markers in a malignant fibrous histiocytoma by spectral karyotyping, comparative genomic hybridization (CGH), and array CGH

In this study, we characterized the chromosomal composition of an intra-abdominal soft tissue sarcoma diagnosed as a malignant fibrous histiocytoma (MFH). By applying a combination of spectral karyotyping, G-banding, and comparative genomic hybridization (CGH), this case was shown to carry large chromosome markers with material mainly from chromosomes 6 and 8. Further characterization of this unique tumor revealed high-level amplifications at the 6q21∼q23, 8p21∼pter, 8q24∼qter, and 12q13∼q21 regions. Using array CGH, these amplified regions were found to include MASL1 in 8p, as well s MDM2 and CDK4 in 12q, which have been shown to be amplified in MFH. Similarly, gains of 6q and 8q have also been seen in MFH. In conclusion, our study demonstrates the occurrence of large chromosome markers in MFH and suggests that the regions 6q21∼q23, 8p21∼pter, 8q24∼qter, and 12q13∼q21 might harbor oncogenes that could play a role in MFHʹs tumorigenesis. In addition, gain of 12q13∼q21, which is typical of well-differentiated liposarcoma, may also occur in MFH, supporting the previously suggested overlap in genetic etiologies between these two tumor types.