Pancreatic cancer cells, coloured scanning electron micrograph (SEM). In the early stages of disease, pancreatic cancer often doesn't cause any signs or symptoms which makes early diagnosis very difficult. About 95% of pancreatic cancers start in the cells that are responsible for making enzymes (exocrine cells) and are known as exocrine tumours. Less than 5% of pancreatic cancers start in the cells that make hormones (endocrine cells) and these are known as endocrine tumours. Unfortunately, pancreatic cancer survival has not shown much improvement in the last 40 years with less than 1% of patients diagnosed with pancreatic cancer surviving more than 10 years. Magnification: x4000 when printed at 10 cm wide