Ryohei Otani, Akitake Mukasa, Masahiro Shin, Mayu Omata, Shunsaku Takayanagi, Shota Tanaka, Keisuke Ueki, Nobuhito Saito. Brachyury gene copy number gain and activation of the PI3K/Akt pathway: association with upregulation of oncogenic Brachyury expression in skull base chordoma. Journal of neurosurgery. 2018. 128. 5. 1428-1437