Supplementary Figure 2a Progression-free survival by extent of surgical resection – P<0.0001 1 0.9 0.8 Probability 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 119 27 0 115 19 1 102 16 2 90 10 3 84 9 4 78 8 5 69 6 6 60 5 7 52 5 8 39 4 9 29 3 10 15 2 11 6 1 12 13 7 1 12 13 14 Years since start of RT Supplementary Figure 2b Overall survival by extent of surgical resection – P<0.0001 1 0.9 0.8 Probability 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 119 27 0 117 25 1 113 21 2 105 15 3 97 13 4 90 12 5 78 10 6 69 6 7 59 6 8 Years since start of RT 42 5 9 32 4 10 17 2 11 14 Supplementary Figure 2c Progression-free survival by extent of surgical resection – patients with posterior fossa tumors (P<0.0001) 1 0.9 0.8 Probability 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 94 25 0 90 18 1 79 16 2 69 10 3 65 9 4 60 8 5 52 6 6 43 5 7 38 5 8 30 4 9 24 3 10 13 2 11 5 1 12 13 14 Years since start of RT Supplementary Figure 2d Overall survival by extent of surgical resection – patients with posterior fossa tumors (P<0.0001) 1 0.9 0.8 Probability 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 94 25 0 92 23 1 88 20 2 83 14 3 76 13 4 70 12 5 60 10 6 52 6 7 45 6 8 Years since start of RT 33 5 9 27 4 10 15 2 11 6 1 12 13 14