LRP1B and malignant peripheral nerve sheath tumor: In addition to the loss of exons in PTEN and TP53 and the loss of CDKN2A/B genes, loss of exons was also found in ATRX (0.9%; bone EWS), BCOR (0.9%; EMCS), ETV6 (0.9%; angiosarcoma), LRP1B (0.9%; MPNST), and NF1 (0.9%; MPNST).