Study of BEBT-908 in Subjects With Advanced Hematological Tumors

"Dose escalation phase：10 or 15、22.5、33.75、45mg/m2, intravenous drip, firstly single dose, after the observation period, the drug was administered continuously for 1 cycle (21 days), 3 times a week, continuous administration for 2 weeks and withdrawal for 1 week.~Dose expansion phase：15 or 22.5mg/m2，intravenous drip, 3 times a week, continuous administration for 2 weeks and withdrawal for 1 week，21 days as cycle."