How does cancer affect cells in the body?

Invade organs: As the cancer grows it produces a proteinase that allows for invasion of blood vessels. It breaks down -e-cadherin to s-ecadherin that allows metastasis. The spread is predetermined by the surface protein on the tumor cell. Once spead to an organ occurs it can grow in that organ and in many instances can destroy the organ function such as liver If TNFproduced cacchexia occurs.