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Here's some info that might be interesting to you, altbeit it is not helpful for the original poster: I used to work at GSI (center for heavy ion research in Germany) and the heavy ion irradiation method developed there can alleviate some of the problems with treatment (primarily the roots problem).

The therapy consists of irradiation with heavy ions, which have two important helpful characteristics: a) they cause more severe cell damage, making therapy of some radiation-resistant tumors possible, and b) their damage is extremely localized in a so-called Bragg-peak, which means you don't have to destroy every cell on the path to the tumor.

Since it is a beam of charged particles, magnets are used to rasterize the tumor, irradiating only the exact tumor location and very little healthy tissue.

Unfortunately, a massive fuckup in the German health system has led to a situation in which there is currently one center that treats patients (HIT in Heidelberg), one completed center that can't go into operation (!) and there will be no new centers built for a few years to come.

The center in Heidelberg is understandably overrun with patients and only young, healty patients with inoperable brain tumors are treated (the precise localization of the cell damage allows for irradiation of tumors close to the eye or the brain-stem).

http://www.ro-journal.com/content/9/1/88