Clinical trials. Trials progress in a very ordered sequence. This is diligently followed until the medication, surgery or process is registered by the relevant authority. I have identified over 7000 academic papers describing Photo Dynamic Therapy. Trials start with TOXICITY. Chlorophyll is part of our diet in salads and vegetables. Proof of concept IN VITRO (in the laboratory). Ovarian cancer was grown on three plates. One treated with light only. One treated with chlorophyll only and one by both (PDT). There was no change in the first 2. The third demonstrated complete destruction of the cancer cells. Proof of concept in live animals and humans (IN VIVO). Then trials in human volunteers in one institution. Then in another independent institution to verify the previous results. Then REGISTRATION.