Deterioration of Health-Related Quality of Life Scores under Treatment Predicts Longer Survival

Abstract

Objectives. Baseline health-related quality of life (HRQoL) scores predict survival, which has already been demonstrated in various studies. However, we were interested in whether changes in baseline scores during treatment are also significant predictors of survival. Methods and Materials. We analysed the data of 400 consecutive cancer patients receiving radiochemotherapy. Leading diagnoses were head and neck cancer (34.5%), rectal cancer (24.5%), and lung cancer (13%). HRQoL was studied at baseline, six weeks after therapy and after each completed year after the start of therapy until drop out of the study using the EORTC QLQ-C30 questionnaire. The change score was calculated as the baseline score subtracted from the score after therapy. Statistics included Kaplan-Meier estimates and Cox regression. Results. High global health status (p=0.005) and low pain scores (p=0.040) at baseline were related to favourable overall survival. Change scores of role functioning (p=0.027), global health status (p<0.018), and pain (p<0.001) were predictive of overall survival. Pain was the superior predictor of survival (p=0.001) among all variables and QoL scores studied by multivariate analysis. A deterioration in pain was associated with a 2.8 times higher chance of survival (HR 0.36). Conclusions. Deterioration of HRQoL baseline pain score by cancer treatment is a favourable and superior prognostic factor for survival.