We consider a mathematical model to describe the growth of a vascular tumor including tumor cells, macrophages, and blood vessels. The resulting system of equations is reduced to a strongly coupled nonlinear parabolic system of degenerate type. Assuming the initial data are far enough from 0, we prove existence of a global weak solution with finite entropy to the problem by using an approximation procedure and a time discrete scheme.
"An Existence Result to a Strongly Coupled Degenerated System Arising in Tumor Modeling." Abstr. Appl. Anal. 2008 1 - 19, 2008. https://doi.org/10.1155/2008/239870