Potential Molecular Predictors of Response to Novel Therapies in Metastatic Pancreatic Neuroendocrine Tumors

Patients will be treated with either sunitinib, everolimus, or traditional chemotherapy according to standard of care. Follow-up with imaging (either MRI or CT) will be performed approximately every 3 months. Unidimensional tumor measurement on standard CT and MRI sequences will be performed, according to guidelines from RECIST v1.1, which will be used to assess for progression of disease. Patients will be followed for up to 5 years. Upon evidence of disease progression, patients will be asked to undergo a post-treatment biopsy. If medically possible and safe, they will stay on the drug until the time of biopsy.