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Image-based surrogate outcome measures. Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST 1.1) categorical treatment responses inform several image-based surrogate outcome measures. The time point of progressive disease (PD) is used to determine both progression-free survival (PFS) and time to progression (TTP). Categorical responses of complete response (CR) and partial response (PR) will determine objective response rate (ORR).
