ALLOGENEIC HEMATOPOIETIC STEM CELL TRANSPLANTATION FOR PRIMARY MEDIASTINAL LARGE B‐CELL LYMPHOMA PATIENTS RELAPSING AFTER HIGH DOSE CHEMOTHERAPY WITH AUTOLOGOUS STEM CELL TRANSPLANTATION: DATA FROM THE JAPAN SOCIETY FOR HEMATOPOIETIC CELL TRANSPLANTATION (JSHCT) REGISTRY. (12th June 2019) - Kondo, E.; Shimizu‐Koresawa, R.; Chihara, D.; Mizuta, S.; Izutsu, K.; Ikegame, K.; Uchida, N.; Fukuda, T.; Ichinohe, T.; Atsuta, Y.; Suzuki, R.