The Effect of Chemotherapy on Lactate Threshold in Cancer Patients

Overview

It is important to assess patients' fitness for major cancer surgery which carries a high risk of mortality. Patients with poor heart and lung function have a higher risk of death after major cancer surgery. Cardiopulmonary exercise testing, CPET, is an objective measure of patients' fitness. Most patients, before surgery to resect their cancer, undergo a period of chemotherapy. Chemotherapy often regresses the cancer but also has adverse effects on cell function. Our hypothesis is that chemotherapy alters patient fitness, as assessed by CPET, prior to major cancer surgery. Participating patients will undergo fitness testing by CPET before and after their chemotherapy, prior to their surgery.

Purpose: To evaluate the effects of chemotherapy on pre-operative fitness of patients prior to major cancer surgery. Design: Patients will act as their own case-control. Patients will be consented at the earliest available opportunity following the decision that they have surgically treatable disease and they consent to pre-operative NAC. Consent for the study will be gained as an outpatient. At "visit 1" patients will undergo CPET, as is our current standard practice, prior to commencing neoadjuvant chemotherapy. As part of the assessment, they will have pulmonary function testing (static lung volumes, lung diffusing capacity),and a nutritional assessment using bioimpedance measurements. They will then undergo 3 cycles of NAC lasting a total of 6 weeks, as is standard current practice at our institution. At "visit 2", approximately four to six weeks following chemotherapy and just prior to planned surgery the CPET and other assessments will be repeated. This is also current standard practice at our institution. Data from visit 1 and visit 2 will be compared in a paired manner. A statistician will be consulted to assess the degree of normality of the data, the statistical tests to use, and for power calculations. At no point will any treatments be postponed or changed solely for the purposes of collecting data for the research. 12 months survival will be assessed as an outcome variable.

Conditions