We performed a phase II study to determine the efficiency and safety of SHR6390, a CDK4/6 inhibitor, in pts with HNMM harboring CDK4 amplification….This study showed that SHR6390 was well-tolerated and appeared to be effective in HNMM pts harboring CDK4 amplification, which hints that it's worthy to further explore SHR6390 in combination with other drugs in the systemic treatment of advanced MM.