After excluding local recurrences, metastases, samples treated with preoperative chemotherapy, the single SS and 3 MPNST (that were outliers from cluster S), the 11 leiomyosarcomas with a distinct profile, and the dedifferentiated/pleomorphic liposarcomas with the MDM2-CDK4 double amplification, 89 primary STS remained for the analysis. The gene discussed is MDM2; the disease is malignant peripheral nerve sheath tumor.