ATG-010(Selinexor) in Combination With Chemotherapy in RRMM

"Selinexor (ATG-010） is a first-in-class, oral selective exportin 1 (XPO1) inhibitor (1,2). Selinexor functions by binding with and inhibiting the nuclear export protein XPO1 (also called CRM1), leading to the accumulation of tumor suppressor proteins in the cell nucleus along with inhibition of translation of oncoprotein mRNAs.~Arm I：80mg/d QW ;"

"Selinexor (ATG-010） is a first-in-class, oral selective exportin 1 (XPO1) inhibitor (1,2). Selinexor functions by binding with and inhibiting the nuclear export protein XPO1 (also called CRM1), leading to the accumulation of tumor suppressor proteins in the cell nucleus along with inhibition of translation of oncoprotein mRNAs.~Arm II：100mg/d QW ;"

25 mg/m\^2 intravenously on day 1 , QW

Dexamethasone 40mg/d QW

Cyclophosphamide：300mg/m2, d1 QW，