Five-year survival of pancreatic ductal adenocarcinoma cancer patients by Mental Component Summary (MCS) scores categorised into tertiles. (A) Overall population (N = 2478), (B) patients with available tumour stage information (N = 1013), (C) patients with stage I & II (N = 318), (D) patients with stage III & IV (N = 695). Higher MCS scores indicate better mental quality of life. High, ≥52.3; medium, 40.3–52.3; low, <40.3.