HDAC4 and atherosclerosis: The possible explanations might be that: (1) elevated HDAC4 could inhibit the disease severity and progression of AIS through suppressing inflammation and restraining the development of atherosclerosis (above‐mentioned), which led to better RFS; (2) the events of mortality was relatively low in the current study, thus it might be difficult to observe statistical significance in the correlation between HDAC4 and OS.