“…de Pillis and Radunskaya [10] presented a mathematical model, showing competition between normal cells and tumor cells considering the role of chemotherapeutic drugs. There are some other research works on tumor-immune dynamics [1,3,4,7,12,13,15,31,33,36,38,40]. Also there are some research works on the tumor growth models with optimal control strategies [8,10,11,[16][17][18][19]30,35].…”