FOXM1 and malignant peripheral nerve sheath tumor: In this regard, CDK4 (Cyclin-dependant Kinase 4) gain/amplification and increased FoxM1 (Forkhead box protein M1) protein expression have been reported as predictors of poor survival in MPNST patients [28], while EGFR (Epithelial Growth Factor Receptor) overexpression is thought to play a role in MPNST progression and has been correlated with worse prognosis and clinical course [29].