The cells themselves aren't harmful it's what they do. A cancer cell divides at a very fast rate. Cancer cells are unhealthy/bad and don’t help your organs to function. Cancer wouldn’t have been a problem, but these cells don’t die like a normal cell. Cancer doesn’t cause death. Cancer cells don’t help your organs to function, and that’s why most patients die from organ failures…Cancer cells have damaged DNA, which does not give the action to stop dividing. Cancer just wants to divide, and it won’t stop untill all your billions of cells are cancerous.