Clinical outcome of patients with recurrent or refractory localized Ewing's sarcoma family of tumors: A retrospective report from the Japan Ewing Sarcoma Study Group oleh Katsutsugu Umeda, Takako Miyamura, Kenji Yamada, Hideki Sano, Ako Hosono, Minako Sumi, Hajime Okita, Tadashi Kumamoto, Akira Kawai, Junya Hirayama, Ryoji Jyoko, Akihisa Sawada, Hideki Nakayama, Yosuke Hosoya, Naoko Maeda, Nobuyuki Yamamoto, Chihaya Imai, Daiichiro Hasegawa, Motoaki Chin, Toshifumi Ozaki, Japan Ewing Sarcoma Study Group