AbstractBackgroundMulti‐component, multi‐target approaches may be needed for treatment of Vascular Dementia (VaD). SaiLuoTong (SLT) consists of active ingredients derived from Ginkgo Biloba, Panax Ginseng and Crocus Sativus. A phase II, randomized, controlled, double‐blind study (NCT01978730) demonstrated the symptomatic efficacy of SLT in VaD, however, the slowing of disease progression remains unexplored. This exploratory analysis is to compare the Vascular Dementia Assessment Scale‐cognitive subscale (VaDAS‐cog) between early‐ and delayed‐starters over a 52‐week period so as to assess the disease‐modification effect of SLT.MethodSubjects with probable mild to moderate VaD were randomized to SLT 360 or 240 mg (early‐starters), or placebo (delayed‐starters). Whilst maintaining blinding, all early‐starters received SLT for 52 weeks and delayed‐starters switched to SLT 360 or 240 mg from placebo at week‐26. Using a modified intention‐to‐treat population of 325 subjects, comparison of change in VaDAS‐cog from baseline between early‐starters and delayed‐starters was performed using linear mixed‐effects models for repeated measurements, with fixed effect of intervention (early‐starters vs. delayed‐starters), time, time and intervention interaction, baseline VaDAS‐cog and randomization stratification factors. An unstructured variance‐covariance structure was employed.ResultEarly‐starters compared to delayed‐starters showed statistically significant improvement in adjusted mean change from baseline in VaDAS‐cog score at all timepoints: (Adjusted mean difference (AMD) [95% CI]: ‐1.53 [‐2.35, ‐0.71]; P<0.001) at week‐13, (AMD [95% CI]: ‐2.69 [‐3.69, ‐1.69]; P<0.001) at week‐26, (AMD [95% CI]: ‐2.15 [‐3.31, ‐0.98]; P<0.001) at week‐39 and (AMD [95% CI]: ‐1.94 [‐3.38, ‐0.51]; P = 0.008) at week‐52. The largest difference (early‐starters vs delayed‐starters) was observed at week‐26.ConclusionIn this analysis, the effect of SLT was observed at week‐13 in early‐starters and sustained until week‐52. Delayed‐starters did not catch up with early‐starters on mean change in VaDAS‐cog from baseline at week‐52, suggesting not only a symptomatic effect of SLT but also a possible disease‐modifying effect.
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