IGF1R and telomere syndrome: Therefore, the summarized data in this review are a good representation of biomarker presence in STS patients: EGFR (n = 1918), PDGFRα (n = 1536), TEM1 (n = 768), IGF-1R (n = 507), VEGFR-1 (n = 477), and VEGFR-2 (n = 449).