In this work, global stability of a free boundary problem modeling solid avascular tumor growth is studied. The model is considered with time delays during the proliferation process. We prove that the unique positive constant steady state is globally asymptotically stable under some assumptions. The proof uses the comparison principle and the iteration method.
"Global asymptotic stability of positive steady states of a solid avascular tumor growth model with time delays." Rocky Mountain J. Math. 48 (5) 1685 - 1702, 2018. https://doi.org/10.1216/RMJ-2018-48-5-1685