Human blood serum of cancer, cancer-recovered and healthy patients contains laevorotatory and dextrorotatory B² active molecules. The laevorotatory B² active carriers in patient serum carry information on the cancer status while the dextrorotatory B² active carriers carry information on the recovered and/or healthy patient status. Their magneto-optical characteristic is analysed by the B² Magneto Optical Circular Birefringence. By applying the MOCB experimental technique, it is possible to differentiate between the cancer and non-cancer patients. The paper introduces a purely molecular physics approach for description of the cancer/recovered and also non-cancer patients status.