[The state of immunity and the cyclic nucleotide system in the radiotherapy of breast cancer].

Indices of the T-system of immunity were lowered in breast cancer patients. Small fractional radiotherapy resulted in its greater suppression. A tumor revealed low pathomorphosis accompanied by a sharp increase in the levels of cyclic nucleotides. Large fractional radiotherapy caused no changes in the state of the immune system correlating with high radiation pathomorphosis in a tumor and a decrease in a cGMP level.