1 Division of Surgical Oncology, Department of Surgery, Moores Cancer Center, University of California, San Diego, 3855 Health Sciences Drive, Mail Code 0987, La Jolla, CA, 92093-0987, USA.
2 Department of Surgery, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA.
3 Division of Hematology Oncology, Department of Medicine, Moores Cancer Center, University of California, San Diego, La Jolla, CA, USA.
4 Division of Anatomic Pathology, Department of Pathology, University of California, San Diego, La Jolla, CA, USA.
5 Division of Gastroenterology, Department of Medicine, University of California, San Diego, La Jolla, CA, USA.
6 Division of Surgical Oncology, Department of Surgery, Moores Cancer Center, University of California, San Diego, 3855 Health Sciences Drive, Mail Code 0987, La Jolla, CA, 92093-0987, USA. jsicklick@ucsd.edu.