HS-Sch-2

The Combination of Genome, Methylome, and Expression Marker Analysis, Represent Useful Tools for a Better Differential Diagnosis and Classification of Malignant Peripheral Nerve Sheath Tumors

Malignant peripheral nerve sheath tumors (MPNSTs) are soft-tissue sarcomas of the peripheral nervous system that develop either sporadically or in the context of neurofibromatosis type 1 (NF1). MPNST diagnosis is challenging and treatment outcomes are poor. Magallón-Lorenz et al. present here a resource consisting of the genomic characterization of 9 widely used human MPNST cell lines for translational research.

Genomic analysis revealed considerable diversity among cell lines, prompting further characterization. Methylome analysis compared all cell lines to reference cohorts of peripheral nerve sheath and soft tissue tumors to clarify diagnostic classification. UMAP analysis showed all NF1-related MPNST cell lines clustered within the MPNST group, whereas sporadic cell lines fell into the melanoma cluster (STS-26T, HS-Sch-2) or MPNST-like sarcomas (HS-PSS) (Fig. 1A). Immunostaining for SOX9, SOX10, and S100B further characterized 8 cell lines. SOX9 was expressed in all lines. All NF1-related lines and STS-26T were negative for SOX10 and S100B, whereas HS-PSS and HS-Sch-2 were SOX10-positive, and HS-Sch-2 additionally expressed S100B (Fig. 1B)-markers consistent with melanoma rather than classic MPNST identity.