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Kaplan-Meier survival estimates comparing patients with curatively intended surgeries (with R0 and R1/R2 outcome) with patients receiving photodynamic therapy (PDT). Survival times differed significantly between R0 resection and PDT (p<0.001), as well as R0 and R1/2 resections (p<0.001), but there was no difference between PDT and R1/2 resections (p=0.52).
