KIF11 is required for the separation of duplicated centrosomes during spindle formation in prophase16 and KIF15 for the maintenance of this spindle.17 KIF23 is involved in telophase and it is essential for cytokinesis.18We first assessed the expression of the 3 kinesins in our set of malignant (MPNSTs and MPNST cell lines) and benign (PNFs, SCs) samples. This evidence concerns the gene KIF15 and malignant peripheral nerve sheath tumor.