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Survival plots by biomarker levels: (A) central-review progression-free survival (PFS) by chromogranin A (CGA); (B) overall survival by CGA; (C) central-review PFS by neuron-specific enolase (NSE); (D) overall survival (OS) by NSE; (E) central-review PFS by 5-hydroxyindoleacetic acid (5HIAA); and (F) overall survival by 5HIAA. HR, hazard ratio; NR, not reported.
