IGF1R and synovial sarcoma: Although non-significant differences were detected between SS patients and SCs in peripheral blood (Figure S1A), IGF1R expression in peripheral blood was negatively correlated with the erythrocyte sedimentation rate (ESR) and IgG serum levels (r = −0.390, p = 0.001, and −0.578, p = 0.030, respectively) and positively correlated with urine-specific gravity values (r = 0.697, p = 0.001).