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Long-term administration of valGCV is more efficient compared with short-term GCV treatment in vivo. (A) Representative MRI (T2 rapid acquisition with relaxation enhancement) images are shown. The solid tumor regions are marked with dashed lines. (B) Kaplan–Meier survival analysis: 3-month valGCV treatment has a significant survival benefit compared with the 3-week GCV treatment (P = 0.008).
