1 Department of Surgical Oncology, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
2 Department of Colon and Rectal Surgery, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
3 Division of Surgical Oncology, Department of Surgery, Maine Medical Center, Portland, ME, USA.
4 Molecular Diagnostics Laboratory, Department of Hematopathology, Division of Pathology-Lab Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
5 Department of Gastrointestinal Medical Oncology, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
6 Department of Anatomic Pathology, Division of Pathology-Lab Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
7 Department of Surgical Oncology, Division of Surgery, The University of Texas MD Anderson Cancer Center, Houston, TX, USA. bhelmink@mdanderson.org.