PCDH9 and malignant peripheral nerve sheath tumor: However, PCDH9 was the only differentially expressed gene (fold-change 1.6, FDR-P = 2 × 10−4 from limma analysis43; Supplementary Fig. S9), and both MPNST groups showed enrichment with the same gene sets relative to neurofibromas (Supplementary Table S9).