Here's the true cause of cancer. This happens when the immune system is weak due to any number of reasons. Fungi take control of the mass of infected cells, stop oxidative metabolism, but maintain fermentative metabolism. Metabolic wastes such as ammonia and fungal enzymes are toxic to adjacent cells. Toxins cause inflammation of them and stop oxidative metabolism, but allow fermentation to continue.
Fungal infection spreads following inflammation.
Inflammation causes the immune system to grow a dense fibrous membrane surrounding the infection to contain it and prevent it from spreading. These fibrous growths take the form of a lump, cyst, ulcer, benign growth, pre-cancerous lesion, etc. X-rays spot them because of increased density. A break in or injury to the fibrous membrane results in the autonomic immune system response to repair the injury by making adjacent membrane cells multiply rapidly. Lack of Healing Causes Unrestrained Growth During the process of doubling, the adjacent cells are infected and mutated by the toxins and pathogens so that offspring cells fail to knit with parent cells and fail to heal the injury.