Long Term Safety Study of SyB C-1101 in Patients With Recurrent/Relapsed or Refractory Myelodysplastic Syndrome (MDS) - Extension Study

"SyB C-1101（rigosertib sodium） will be administered orally twice daily for 14 consecutive days, followed by 7-day observation period. The treatment period of 21 days (14 days of administration + 7 days of observation) constitutes 1 cycle.~The dose at cycle 6 in the study 2012002 will be the dose (if needed, the dose can be reduced) at the first cycle in this study (cycle 7).~From cycle 8 on, the dose of SyB C-1101 will be reduced, delayed, or discontinued according to adverse events and results of observation at the previous cycle."