The investigators are interested in identifying whether (CPET) offers additional benefit over that of WHO PS in the assessment of patients fitness for palliative chemotherapy for pancreatic cancer, by identifying those patients who might survive longer and tolerate chemotherapy better, thus predicting their outcome. The CPET variables most commonly used in risk prediction models are the volume of oxygen taken up at the anaerobic threshold relative to body mass (maximal oxygen consumption,VO2 at anaerobic threshold (AT)), the Peak oxygen uptake achieved during the exercise test relative to body mass (VO2 peak) and the oxygen pulse (O2 pulse) which is a derivative value involving oxygen uptake and the heart rate.