Tumor tissue and plasma levels of AXL and GAS6 before and after tyrosine kinase inhibitor treatment in EGFR‐mutated non–small cell lung cancer oleh Yoshikane Nonagase, Masayuki Takeda, Koichi Azuma, Hidetoshi Hayashi, Koji Haratani, Kaoru Tanaka, Kimio Yonesaka, Hidenobu Ishii, Tomoaki Hoshino, Kazuhiko Nakagawa