The purpose of this study is to collect and store normal and malignant tissue from patients with gastric cancer, GIST, esophageal cancer, pancreas cancer, hepatocellular cancer, biliary cancer, neuroe
Introduction: Malignant peripheral nerve sheath tumors (MPNST) are common in the peripheral nerves of the head, neck, and limbs, with few reports of their occurrence in the breasts, and the epithelioi