Finally, proximal proteomics reveals Kirsten rat sarcoma virus (KRAS), but not Harvey rat sarcoma virus (HRAS) or neuroblastoma Ras viral oncogene homolog (NRAS), associates with neurofibromin in iPN cells, and pan-KRAS inhibition is sufficient to block ERK activation and CDK1/2 activation in NF1 mutant cells, suggesting blocking KRAS may be a therapeutic approach for NF1 mutant PNS tumors. The gene discussed is KRAS; the disease is paraneoplastic neurologic syndrome.