Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the stages of Pancreatic Neuroendocrine Tumors (Islet Cell Tumors) ?
    ### Response:
    Key Points
                    - The plan for cancer treatment depends on where the NET is found in the pancreas and whether it has spread.     - There are three ways that cancer spreads in the body.    - Cancer may spread from where it began to other parts of the body.
    