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Kaplan-Meier survival curves for stage IV patients in serum studies. A: OS of stage IV patients with methylated vs. unmethylated AIM1 cf-cDNA. B: OS of stage IV patients with LINE1 unmethylated and/or AIM1 methylated cf-cDNA vs. those with LINE-1 methylated and AIM1 unmethylated cf-cDNA.