Multicentre, phase II study of eribulin in combination with S-1 in patients with advanced breast cancer oleh Tsutomu Iwasa, Junji Tsurutani, Satomi Watanabe, Ryoji Kato, Yutaka Mizuno, Yasuyuki Kojima, Tsutomu Takashima, Nobuki Matsunami, Takashi Morimoto, Jun Yamamura, Shoichiro Ohtani, Yuko Tanabe, Tetsuhiro Yoshinami, Toshimi Takano, Yoshifumi Komoike, Kazuhiko Nakagawa