美股周一早盘，临床阶段药物开发商Keros Therapeutics（KROS）上涨2.1%，此前该公司宣布启动要约回购最多1.944亿美元自身股票。此举是其更广泛的3.75亿美元资本回报计划的一部分，反映了Keros在战略增长计划中提升股东价值的承诺。

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