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Table 2: Radiomics model performance for prediction of OS and PFS
Outcome/ MR Imaging Time Point Training Site Testing Site OOB Training, Mean 
C-Index (95% CI) Testing AUC, Mean 
C-Index (95% CI)
OS 
 Pretreatment Sites 2–6 (n = 72 Site 1 (n = 31) 0.471 (0.467–0.474) 0.521 (0.515–0.527)
Site 1, 3–6 (n = 74) Site 2 (n = 29) 0.523 (0.517–0.530) 0.472 (0.468–0.476)
Site 1–2 (n = 60) Site 3–6 (n = 43) 0.529 (0.526–0.532) 0.485 (0.483–0.488)
 First on-treatment Sites 2–6 (n = 70) Site 1 (n = 32) 0.690 (0.688–0.692) 0.750 (0.747–0.753)
Site 1, 3–6 (n = 73) Site 2 (n = 29) 0.710 (0.708–0.713) 0.748 (0.744–0.752)
Site 1–2 (n = 61) Site 3–6 (n = 41) 0.721 (0.719–0.723) 0.692 (0.691–0.694)
PFS 
 Pretreatment Sites 2–6 (n = 72) Site 1 (n = 31) 0.469 (0.467–0.472) 0.524 (0.518–0.530)
Site 1, 3–6 (n = 74) Site 2 (n = 29) 0.521 (0.515–0.526) 0.472 (0.469–0.476)
Site 1–2 (n = 60) Site 3–6 (n = 43) 0.528 (0.524–0.531) 0.486 (0.484–0.488)
 First on-treatment Sites 2–6 (n = 70) Site 1 (n = 32) 0.660 (0.658–0.663) 0.691 (0.688-0.693)
Site 1, 3–6 (n = 73) Site 2 (n = 29) 0.641 (0.640–0.643) 0.715 (0.712–0.717)
Site 1–2 (n = 61) Site 3–6 (n = 41) 0.648 (0.645–0.650) 0.680 (0.677–0.683)
Note:—OOB indicate out of bag.