Moreover, to better characterize the metastatic phenotype, one of the synchronous micrometastases of MPNST-SP-002 was immunochemically characterized using four antibodies: vimentin, CD34, S100, and Ki-67, which were a perfect match with the corresponding orthoxenograft MPNSTs (Supplementary Fig S2). The gene discussed is MKI67; the disease is malignant peripheral nerve sheath tumor.