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Table 1 Contribution of LOH and NF1 micro-lesions to the somatic NF1 mutational spectrum in different types of NF1-associated tumour

From: Neurofibromatosis type 1-associated tumours: Their somatic mutational spectrum and pathogenesis

Tumour type

LOH

Point mutations

Total

Dermal neurofibroma

144 (40%)

211 (60%)

355

Plexiform neurofibroma

67 (79%)

18 (21%)

85

Spinal neurofibroma

7 (70%)

3 (30%)

10

MPNST

55 (85%)

10 (15%)

65

Astrocytoma

18 (100%)

0 (0%)

18

GIST/gastric carcinoid

3 (38%)

5 (62%)

8

JMML

18 (95%)

1* (5%)

19

Phaeochromocytoma

10 (100%)

0 (0%)

10

Glomus tumour

1 (14%)

6 (86%)

7

Overall

323 (55%)

254 (44%)

577

  1. * Compound heterozygous NF1 mutations were identified in five of six haemopoietic tumours analysed. As no other normal tissues were available in these five cases, it was not possible to distinguish between the associated germline and somatic NF1 mutations.