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Disease specific survival from start of salvage immunochemotherapy for all patients (A) and according to response by visual assessment and ΔSUVmax cutoff of 50% on PET/CT from D4 (B-C) and D21 (D-E), respectively.
D: day; PET: positron emission tomography; SD: stable disease; PD: progressive disease; CR: complete response; PR: partial response; SUVmax: maximum standardized uptake value.
