We also identified a cluster of co-expressed genes representing a presumptive gained chromosomal region – the “12q13–15 gain cluster” - of which 86% of genes, including MDM2 and CDK4, are located on the 12q13–15 chromosomal region; as expected, its expression was visually associated with dedifferentiated liposarcomas. The gene discussed is CDK4; the disease is liposarcoma.