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Kaplan–Meier estimates of progression-free survival (PFS, a) and overall survival (OS, b) in accordance with a prognostic score of 1–2 versus 3–4 points, which was a combination of the initial ISS score (1,2 or 3 points) with the presence of more than three focal lesions detected on PET (>3 FL: 1 point) or less than/equal to three FLs (≤3 FLs, 0 points).
