Estimates of OS and PFS according to the value of functional 18FDG-PET parameters in the PET/CT scan performed during the initial staging of 103 patients with primary mediastinal large cell lymphoma enrolled in the IELSG 26 prospective study. (A-C) Kaplan-Meier estimates of OS. (D-F) Kaplan-Meier estimates of PFS. Cutoff values are reported in Table 2. High, above the cutoff values calculated by ROC analysis; low, at or below the cutoff values calculated by ROC analysis.