Searching for causes of the cancer scientists take into account various agents. Among others, those being products of the contemporary civilization. Electromagnetic radiation and ionizing radiation coming out of artificial sources belong to them. Also, electrostatic and magnetic fields are considered as agents causing the cancer of tissues. Cancerogenesis is also induced by some chemical compounds such as: aromatic hydrocarbons, heterocyclic hydrocarbons, aromatic amins, azo-dyes, some metalic compounds, vinyl-chloride, vinyl-polychloride, carbon-disulfide, some stilbens and nitrites. An effect of cancer causing agent depends on the level of filogenetic and ontogenetic development of the organism. It also depends on certain coordinating fac...