新英格兰医学周刊在2006年2月9日出版的一篇长达一年的研究报告显示，这种草药并不比诸如安慰剂等药片在治疗BPH上更有效果。
Published in the Feb. 9, 2006, New England Journal of Medicine, the yearlong study found that the plant extract was no more effective than inactive pills (placebos) in easing symptoms of BPH.
他和他的研究小组比较了漱口剂，冰片和安慰剂在225名接受化疗的胃肠道肿瘤患者身上的效果。
He and his team compared the effectiveness of mouthwash, ice chips and a placebo in 225 patients being treated for gastrointestinal cancer.
根据计划，当中期分析显示索拉非尼的效果明显优于安慰剂时，研究会过早的中止。
The study was stopped prematurely when a planned interim analysis showed sorafenib's significant superiority over placebo.
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