In most cases, beef has a lot of fats. Even if you buy the beef that is pure red meat it still have more than enough fats. Pancreas has a digestive function and eating beef will only overwork your pancreas. Avoid beef as much as possible because overworking your pancreas when you already have pancreatic cancer is very dangerous. For proteins in your body just consider taking some eggs or beans. They are as rich in proteins as beef but at least they have less fats.