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PD-L1+ EVs can be used as a marker of progression-free survival in SCLC. Kaplan–Meier estimates of progression-free survival (PFS) in patients according to total PD-L1 (n = 70, P = 0.063) (A) or exosomal PD-L1 (n = 70, P = 0.0002) (B). HR, hazard ratio; CI, confidence interval.
