Patient Recorded Indexing Measurements

Rationale: One of the greatest challenges in the field of cancer treatment is cachexia, a multifactorial syndrome characterized by substantial loss of body weight (muscle and fat mass), leading to progressive functional impairment. Cancer cachexia significantly impairs quality of life and survival as well as treatment outcome. Despite its considerable relevance for the prognosis of cancer patients, the diagnosis of cachexia is problematic. The current consensus definition of cancer cachexia is based on weight loss over the last six months. In practice, this is assessed by subjective reporting by the patient, which is subject to error and bias. Novel technologies enable accurate, standardized, and objective assessment of body weight and physical activity by newly diagnosed cancer patients in the home situation. Because of the increasing implementation of neo-adjuvant treatment strategies that offer an extended time-window for the collection of these data, there is a great opportunity to use this information in risk analyses by treating physicians, optimization of pre-habilitation programs, and in the shared-decision making process with the patient. Objective: The central aim of the 'Patient-Recorded Indexing MeasurementS' (PRIMS) study is to improve the accuracy of the diagnosis of cachexia in patients with cancer. This aim will be achieved by focusing on two objectives. The primary objectives are to compare self-reported and objectively measured pre-treatment weight change. The secondary objectives are to define host phenotypes and to investigate longitudinal associations between body weight and physical activity patterns. Study design: Explorative pilot study Study population: Patients ≥18 years old undergoing curative-intent chemotherapy or surgery for cancer. Patients will be included in two referral centers specialized in treatment of patients with upper gastrointestinal, hepatobiliary, pancreatic, colorectal, and ovarian cancer. Main study parameters/endpoi