Effect of a single dose of FP3 on the morphology of the tumor vessels in established PDTT xenograft of gastric carcinoma. Representative fluorescent microscopic images (bar, 100 μm) show: (day 0; A, D and G) vasculature in mice prior to administration of FP3 (15 mg/kg); and (day 2; B, E and H) 3 days and (day 4; C, F and I) 5 days following administration of FP3 (15 mg/kg). PDTT, patient-derived tumor tissue.