KIDINS220 and synovial sarcoma: In contrast, the median ESTIMATE scores for PRMS were significantly higher than those of ERMS (ERMS.NCI, p = 2.99e−07) and of fusion-driven sarcomas that have lower mutational burden and do not respond well to ICB such as ARMS (ARMS.NCI, p = 1.05e−07) and synovial sarcoma (SARC.SS.TCGA, p = 9.25e−07).