Successful conversion surgery for stage IV gastric cancer with liver metastases after second-line chemotherapy with ramucirumab and paclitaxel: a case report oleh Kosuke Fukuda, Takaaki Arigami, Koki Tokuda, Shigehiro Yanagita, Daisuke Matsushita, Yota Kawasaki, Satoshi Iino, Ken Sasaki, Akihiro Nakajo, Mari Kirishima, Akihide Tanimoto, Hitoshi Tsubouchi, Hiroshi Kurahara, Takao Ohtsuka