In vivo therapy of X-PDT. a) Tumor growth, assessed by monitoring BLI signal changes at different time points. Compared to irradiation alone, X-PDT much more efficiently suppressed tumor growth. *** P<0.001. b) Representative BLI images for the three treatment groups, taken on Day 7. c) H&E staining on tumor tissues. Compared to the control and irradiation alone, X-PDT effectively controls the tumor generation in the lung. Scale bars, 200 μm.