A secondary RET mutation in the activation loop conferring resistance to vandetanib oleh Takashi Nakaoku, Takashi Kohno, Mitsugu Araki, Seiji Niho, Rakhee Chauhan, Phillip P. Knowles, Katsuya Tsuchihara, Shingo Matsumoto, Yoko Shimada, Sachiyo Mimaki, Genichiro Ishii, Hitoshi Ichikawa, Satoru Nagatoishi, Kouhei Tsumoto, Yasushi Okuno, Kiyotaka Yoh, Neil Q. McDonald, Koichi Goto