RecruitingClinical trialA Study to Determine Whether Perioperative Energy Dynamics Correlates With Postoperative OutcomesTo validate a new method for assessing perioperative risk in the cancer patient undergoing major cancer surgery. In this proposed study researchers will: 1. Measure preoperative energy reserve capacity (fitness) 2. Determine if postoperative morbidity is a function of perioperative cardiopulmonary gas exchange metabolism