The cancer cells are different from normal human body cells. The scientists advocating the Somatic Mutation Theory guessed that cancer is caused when mutations have caused the Human Genome of the human body-cells to change into the Cancer Genomes of the cancer cells. There is no evidence, however, indicating that there has ever been such a change, or that cancer cells have ever been human body cells. There is no evidence that the difference has resulted from changes, or mutations. Also there is

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... no reason to assume that mutations of the Human Genome would cause the cancer cells to grow and replicate out of control. Chinese medical scientists have found, during the last half-century, a wealth of evidence that some forms of cancer may have been caused by the nitrite pollution of the public water supply. China's Deep Standardized Well Water (DSWW) Program of substituting nitrite-free deep groundwaters as the source of public water supply was partially successful. Local cancer-mortality rate was reduced by half at places where there is such a substitution. We found that cancer cells have inherited, not mutated, Cancer Genomes that encode uncontrolled growth and replication. In addition, PET scan studies have indicated that some cancer cells encode a metabolism of aerobic glycolysis under hypoxic conditions. Nitrite, as a reducing agent, could be the indispensable chemical in our food or drink intakes that could render the interior of cancer cells anaerobic. Nitrite, as an oxidation agent, could then be the substrate of the metabolic reaction anaerobic ammonium oxidation (anammox). A corollary of such a hypothesis is thus that cancer cells could be "starved" to death if there is no supply of nitrite to the cancer cells as a substrate of their metabolism. We recommend to the governments' National Health Services to look into this matter that nitrite in public water is a health hazard.