RE:The Field of PDT Continues to Evolve…The previous investigation used Hypericin & Foscan. These are both 2nd generation photosensitizers which are known to be less tumor specific. Unfortunately, many recent PDT/light delivery advances being made or under study are utilizing 1st & 2nd generation PSs. Although Roswell Park didn't come to fruition, the right partnerships using our 3rd generation PS (TLD 1433/Rutherrin)/PDT technology could certainly advance this ACT platform much further & faster imo.