Fig. 1: IGF-1R associates with adverse outcome in paediatric but not adult HGG.
a Representative images of adult and paediatric HGGs scored 0–3 for IGF-1R intensity, with normal brain for comparison. Scale bar 100 μm. b Percentages of adult (n = 305) and paediatric (n = 103) HGGs scored 0–3 for IGF-1R staining intensity. c IGF-1R score by IDH1R132H mutation status in aHGG. There were 45/305 cases with mutant IDH1 including 26 of 208 cases (12.5%) with negative/weak IGF-1R (score 0-1) and 19 of 97 with moderate/strong IGF-1R (19.5%, p = 0.12, Chi-square test). d IGF-1R score by H3.3 status in pHGG. The 47 wild-type H3.3 pHGGs included 26 with negative/weak and 21 moderate/high IGF-1R, while the equivalent data for the nine H3.3 mutant tumours were 4 and 5, respectively (p = 0.55, Chi-square test). e, f Kaplan-Meier survival curves for e, adult (n = 260) and f, paediatric patients (n = 65) by intensity of IGF-1R staining. There was no difference in outcome by IGF-1R score in the adult patients, with median overall survival of 10.4 months in those whose tumours scored negative/weak, and 10.0 months for those with moderate/strong IGF-1R tumours (p = 0.8251). Paediatric patients whose tumours scored 2–3 (moderate/strong) for IGF-1R had significantly shorter survival than those whose tumours scored 0–1 for IGF-1R (13.5 months vs 29 months, p = 0.011 by Log-Rank [Mantel-Cox] test).
