Diaz, J.I.Tello, J.I.2007-08-162007-08-162000-12https://hdl.handle.net/11299/3502We study a model of growth of tumors with a free boundary, delaying the tumor region. We take into account the presence of inhhibitors and its interaction with the nutrients. We study the approximate controllability of the internal distribution of density of cells, that is propotional to concentration of nutrients, injecting inhibitor in a small inner region 0 .