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). Here, CD34 is linked to malignant peripheral nerve sheath tumor.