1. A 30-year-old woman undergoes a distal pancreatectomy for a 6 cm mass in the tail of the pancreas. Gross examination reveals a well-demarcated, solid, fleshy mass. Microscopically, the tumor shows nests and sheets of polygonal cells arranged between small blood vessels. The tumor cells have clear to eosinophilic cytoplasm and elongated nuclei with longitudinal grooves. What is the most likely immunohistochemical profile of the tumor?