If there is sufficient collagen in your body can effectively prevent cancer cells spreading to other parts of the body.
Think of cells in a cell tissue like bricks in a wall. The strength of a brick wall is not truly in the bricks, for a stack of bricks can easily be pushed apart. So might a group of cells. Collagen is the "mortar" that binds your cells together, just as mortar binds bricks together.
If collagen is abundant and strong, your cells hold together well. If cells stick together, tumors have a tough time spreading through them. Strong collagen can thereby arrest the spread of cancer.
Cancer cells secrete a substance called hyaluronidase, which helps them eat away at collagen and break out into the rest of the body. If cancer cells are going to try to spread by destroying a person's collagen, it just makes sense to make lots more collagen to keep them from doing it.
