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

4) Consider a spherical tumor, of radius RT, releasing the angiogenic factor VEGF into the surrounding tissue. Assume the tumor is an infinite source of VEGF at the concentration CT, 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 JT.

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