The role of this protein in living organisms is very large, and includes participation in the processes of DNA repair, cell cycle arrest, apoptosis, and aging; in this regard, it has received the name “guardian of the genome.” In more than 50% of tumor cell cultures, the p53 protein is mutated [6], which makes it possible to use a fairly wide range of biological and chemical methods for its activation or restoration of its function. The gene discussed is TP53; the disease is neoplasm.