[Phylogenetic aspects of acquired immunity]

A review of literature on phylogenesis of acquired immunity shows an increasing activity and potential of this complex apparatus. This system is responsible for the immunosurveillance, i.e. the control and recognition of transformed cells. Obviously the functions and morphology of the immune competent apparatus become more active and specific with growing complexity of living conditions. Since organisms become the more vulnerable the higher stages of development are reached, the sense of this evolution lies in protecting these organisms against environmental influences and in allowing survival. Recognition and elimination of malignant cells is part of this capacity acquired by evolution.