Outcome in Colorectal Cancer: Identification of Differences and Measures for Nationwide Quality Development

Interventions: Group 1: The patients are interviewed on the basis of an internationally recognized questionnaire (EORTC QLQ-30 and QLQ-C29) on their general well-being and physical fitness, on mental health problems and on physical problems. The survey takes place at two measuring times: before therapy and once again after 12 months. The total duration of the study is three years. Primary outcome(s): health-related quality of life measured by EORTC QLQ-C30 and QLQ-CR29; pretherapeutically and once again posttherapeutically after 12 months Study Design: Allocation: ; Masking: ; Control: ; Assignment: ; Study design purpose: other