Abstract
OBJECTIVES: This study compares health-related quality of life (HRQoL) of older patients with pancreatic ductal adenocarcinoma (PDAC) to controls without cancer, and examines the impact of medical comorbidities on HRQoL. MATERIALS AND METHODS: We conducted a case-control study using the 1998-2011 Surveillance, Epidemiology, and End Results-Medicare Health Outcomes Survey (SEER-MHOS) linked dataset. Cases were Medicare beneficiaries aged 65 and older diagnosed with PDAC (N = 128) and matched controls were without a history of cancer (N = 512). We used the Short Form 36 (SF-36) and Veterans-RAND-12 (VR-12) to examine HRQoL and calculated mental (MCS) and physical (PCS) component scores. Linear regression and mixed effects models were used to examine the impact of medical comorbidities on MCS and PCS for cases and controls, respectively. RESULTS: Cases reported significantly poorer PCS (29.3 vs. 36.3) and MCS (44.8 vs. 49.9) compared to controls. Comorbidities were significantly associated with lower PCS and MCS in controls. However, neither total number of comorbidities or comorbidities grouped by organ systems (cardiopulmonary disease, musculoskeletal disease, diabetes) were significantly related to PCS or MCS for cases. Comparison of regression coefficients estimates did not indicate that lack of significance was due to differences in sample size. CONCLUSIONS: The results of this study highlight the poor HRQoL reported by older patients with PDAC. HRQoL scores were very low in this population, particularly in physical health status, which were not explained by comorbidities.