LY6E: a conductor of malignant tumor growth through modulation of the PTEN/PI3K/Akt/HIF-1 axis by Yeom, CJ, Zeng, L, Goto, Y, Morinibu, A, Zhu, Y, Shinomiya, K, Kobayashi, M, Itasaka, S, Yoshimura, M, Hur, C-G, Kakeya, H, Hammond, EM, Hiraoka, M, Harada, H