  A two-dimensional free boundary model for the growth of multi-layer tumors
has been proposed in [S. Cui, J. Escher: ARMA 191 (2009) 173-193] where the
authors derive well-posedness in a functional analytic setting, the stationary
solutions and their asymptotic stability. In this note, we consider once again
the cancer growth model of [S. Cui, J. Escher: ARMA 191 (2009) 173-193] but
coping without periodic boundary conditions for the $x$ variable which is
reasonable from the point of view of modeling. The paper points out that the
generalized model allows for the same stationary solutions as compared to the
model with periodic boundary conditions.
