Boruta plot showing the importance ( x -axis) of each CpG site for the five CpG clusters. The 35 CpG sites from the preselected set of 216 CpG sites (y-axis) that met the inclusion criteria for a reliable influence on gene expression (Table 3) are labeled with the annotated gene name and are highlighted in red. The order of the CpG sites is listed in Additional file 1: Table S6. CpG sites are marked in green when they did not meet the inclusion criteria. CpG sites without gene expression data are marked in blue. DDLS, dedifferentiated liposarcoma; LMS, leiomyosarcoma; MFS, myxofibrosarcoma; MLS, myxoid liposarcoma; MPNST, malignant peripheral nerve sheath tumor; PLS, pleomorphic liposarcoma; SS, synovial sarcoma; UPS, undifferentiated pleomorphic sarcoma.