Over the years there had been scattered reports that PDT not only destroys tumors locally but also evokes antitumor immune responses that target and attack distant metastases.

• 在过去的几年中一些零散的关于PDT的报道称，PDT不仅可以在局部破坏肿瘤，还可以引发机体的抗肿瘤免疫反应以阻止肿瘤的远处转移。