Sixty-five samples were subjected to chr8 FISH: 13 cases of ERMS, eight cases of PRMS, eight cases of LMS, eight cases of WDLPS and their eight corresponding DDLPS, 10 cases of NF1-MPNST, and 10 cases of non-NF1 MPNST. This evidence concerns the gene NF1 and malignant peripheral nerve sheath tumor.