Stability Analysis of Delayed Immune Response BCG Infection in Bladder Cancer Treatment Model by Stochastic Perturbations

We present a revised mathematical model of the immune response to Bacillus Calmette-Guerin (BCG) treatment of bladder cancer, ´ optimized according to biological and clinical data accumulated during the last decade. Te improved model accounts for cytotoxic T lymphocyte diferentiation as an integral element of the delayed immune response, as well as the logistic growth terms for cancer cell proliferation. Tree equilibria are demonstrated for the proposed model, which is assumed to be infuenced by white noise stochastic perturbations that are directly proportional to the system state deviation from an equilibrium. Stability conditions for all equilibria are analyzed using the Kolmanovskii-Shaikhet general method of Lyapunov functionals construction.