A surgical oncologist is a well-qualified surgeon who has obtained additional training and experience in the multidisciplinary approach to the prevention, diagnosis, treatment, and rehabilitation of cancer patients, and devotes a major portion of his or her professional practice to these activities and cancer research. Source: Society of Surgical Oncology, 2007 [1/1/2008: definition added, source added, 7/1/2009: definiition reformatted]