Indeed, some factors were found as risk indicators in MPNST related literatures, such as NF1 status [11, 13, 30, 48], negative margin [13, 30], and non-adoption of adjuvant therapy [28, 32], while several literatures [7, 14, 35, 49] failed to find prognostic power. The gene discussed is NF1; the disease is malignant peripheral nerve sheath tumor.