1. A patient with a 7 cm mass in the head of the pancreas undergoes a pancreatectomy.  The mass contains numerous small cysts, some of which are larger toward the periphery, and a stellate scar. Microscopically, the tumor shows multiple small back-to-back cysts lined by uniform clear cuboidal cells. The cells have clear cytoplasm due to abundant intracellular glycogen. What are the most likely molecular genetic findings in this tumor?