GPT and malignant peripheral nerve sheath tumor: When evaluating the entire MPNST cohort (including sporadic tumors and tumors with unknown NF1-status), median survival for patients was 28 months for ALT-positive tumors, 31 months for ALT-negative tumors, 32 months for normal telomeres, and not reached for short telomeres (Additional file 1: Figure S2a,b).