Measuring the functional decline of people with advanced-stage non-small cell lung cancer (NSCLC).
e19605 Background: People affected by lung cancer maybe highly symptomatic. This study aimed to quantify changes in physical function and health-related quality of life (HRQoL) in patients with advanced NSCLC. Methods: A prospective cohort study was performed. Patients with stage III and IV NSCLC were recruited within one month of starting treatment and assessed at baseline, 2, 4 and 6 months or until they became too unwell. HRQoL and functional status were measured using the EORTC QLQ-C30, the 6-minute walk test (6MWT) and timed up and go test (TUG). Comparisons between baseline and follow-up assessments were carried out by fitting linear mixed models to each outcome separately. Results: 39 patients (21 male) were included in the analysis; median age of 63 (range 40-80). 59% were receiving treatment with curative intent. 28% had stage 4 disease with 26% deceased by 4 months. Response rates at 2 and 4 months were 71.8% and 53.8% for 6MWT and TUG and 87.2% and 64.1% for EORTC. The mean 6MWT at baseline was significantly lower than predicted for the age, sex and height of the cohort (417.9 versus 550.4 metres, p<0.0005). Significant decline in mean 6MWT distance was seen at 2 (decrease of 42.4m, 95%CI -59.0, -25.7, p<0.0005) and 4 month follow-ups (decrease of 63.6m, 95%CI -85.6, -41.5, p<0.0005) compared to baseline. Significant increases in time taken to complete the TUG were also seen at 2 (increase of 0.76 sec, 95%CI 0.54 – 0.98, p<0.0005) and 4 month follow-ups (increase of 1.01 sec, 95%CI 0.76 – 1.27, p<0.0005) compared with baseline. In contrast, global health status and physical functioning as assessed by the QLQ-C30 showed small but significant decreases at the 2 month follow-up compared to baseline (decrease of 8.04, p=0.01 and decrease of 7.67, p=0.024 respectively), but no significant differences between baseline and the 4 month follow-up. Conclusions: Patients with advanced NSCLC show clinically and statistically significant decrements in physical function at commencement of treatment. This continues to decline rapidly and significantly over time, despite small changes in self-reported HRQoL. The 6MWT demonstrated clinically relevant changes in physical function. Interventions to address this problem are urgently needed.