## Determine the concentration gradient outside the tumor as a function of r, in the absence of convection.

4) Consider a spherical tumor, of radius R_{T}, releasing the angiogenic factor VEGF into the surrounding tissue. Assume the tumor is an infinite source of VEGF at the concentration C_{T}, and this drops to 0 as r approaches infinity. Determine the concentration gradient outside the tumor as a function of r, in the absence of convection.

5) Consider the tumor of the problem (A), but with a known flux at the tumor perimeter of J_{T}.

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