Just stumbled onto this. It sounds promising.
Next-generation" photodynamic therapy / (NGPDT)

The treatment revolves around two components: a chlorophyll-based photosynthesizing agent and the PDT light therapy. They give you the photosynthesizing agent one day and the light therapy the next. This is done in three treatments over six days. The first two days are spent in preparation and examination.
The agent finds the cancer cells and the light activates it. This creates singlet oxygen cells which can destroy the cancer cells. [www.nextgenerationpdt.com] Watch the short video's.

Proof will be in results.
If it indeed is that efficacious and by the sound of it relatively cheap then i'd expect a lot of resistance from the industry.