TNFRSF18 and cancer: Analysis of the transcript levels of the costimulatory receptors OX40/TNFRSF4 (Figure 3(b)), ICOS (Figure 3), and GITR/TNFRSF18 (Figure 3(d)) indicated that ICOS and GITR transcripts were not highly expressed in any sarcoma subtype relative to other cancers in the TCGA dataset.