First line chemotherapy for malignant peripheral nerve sheath tumor (MPNST) versus other histological soft tissue sarcoma subtypes and as a prognostic factor for MPNST: an EORTC Soft Tissue and Bone Sarcoma Group study Malignant Peripheral Nerve Sheath Tumor, Causes, Signs and Symptoms, Diagnosis and Treatment. Improving our Understanding of the Management and Pathogenesis of Rare and Neglected Tumors of the Central and Peripheral Nervous System Frontiers Research Topic Pathology Outlines Malignant melanotic nerve sheath tumor