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Measurements of extracellular pH show that the micro environment of malignant tumors is more acidic than that of normal cells, whereas pH does not differ appreciable in normal and malignant cells. The acid micro environment of tumors is created by the secretion of tumor factors and ATP hydrolysis in hypoxic tumor tissue. In order to survive in a low pH-environment tumor cells develop regulatory mechanisms which keep their intracellular pH stable. Two of the most important systems are the Na+/H+ ion pump and the Na-dependent HCO3-/Cl- pump of stilbenian derivatives.

Repeated Administration of Inhibitors for Ion Pumps Reduce Markedly Tumor Growth in Vivo