Beyond actual CR rate is the question of durability. Although CR % is high, how durable are the CRs? That's important to know as they often aren't very durable in heme onc.
MEIP recently in-licensed a PI3K and I assume they intend to combine the PI3K with pracinostat. Note that CRIS is already well ahead of them in this regard with their dual PI3K/HDAC inhibitor CUDC-907.