good readshttps://pubmedcentralcanada.ca/pmcc/articles/PMC4811612/
https://www.openpr.com/news/698925/Global-Cancer-Photodynamic-Therapy-Market-and-Cancer-Photosensitisers-Clinical-Trial-Outlook-2023.html
https://www.siliconrepublic.com/people/fergus-poynton-cancer-research
(regarding diagnostic capabilities in next generation compounds, not tlt,, but mentions tlt)