[Are there pseudophototropic reactions in biology? Part 2: Pseudophototropy and the course of cancer (author's transl)].

The phenomenon of pseudophototropy is compared with well-known theories of the origin and treatment of cancer, by means of practical medical experiments. The reaction cycles or life processes of both systems are comparable, in spite of considerable differences between them, and suggest, at least as a hypothesis, that there is a general mechanism for the formation of double-bond sequences liable to reaction.