No significant differences in the other components of the IGF1/IGF1R axis, including IGFIEa (0.9 ± 1 vs. 1 ± 1.4, p = 0.55), IGFIEb (3 ± 3.3 vs. 5.6 ± 9.5, p = 0.67), IGFIEc (1.6 ± 4.3 vs. 2.1 ± 3.8, p = 0.87), IGFBP3 (1.4 ± 2.3 vs. 0.9 ± 1.6, p = 0.40), and IGFBP6 (2.3 ± 2.1 vs. 1.6 ± 0.7, p = 0.80) mRNA expression, were detected in MSG biopsies derived from SS patients compared to SCs (Figure S1). This evidence concerns the gene IGFBP6 and synovial sarcoma.