Identification of patient-related factors associated with Health-Related Quality of Life (HRQoL) and Quality of Life (QoL) at the start of treatment may identify patients who are prone to a decrease in HRQoL and/or QoL resulting from chemotherapy. | The association of depressive symptoms personality traits and sociodemographic factors with health-related quality of life and quality of life in patients with advanced-stage lung cancer An observational multi-center cohort study