NF2 and neoplasm: The presence of circulating tumour DNA was significantly associated with NF2 mutation (p = 0.015 Fig. 2b), loss of 1p36.11 loss (p = 0.015) and/or 6q25.1-2 (p = 0.018) and lack of lymph node involvement (p = 0.024, Fisher’s exact test), supplementary fig. 7B and supplementary data 9–11.