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But people who take placebos don't always get better, and in some cases, they actually feel worse.
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Among the 40 patients, 27 received the gene-delivery product, while 13 took placebos.
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In those studies, one group took estrogen, another took estrogen and progestin and the other two took placebos.
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That compared to 30 percent of participants taking placebos - a difference that could have been due to chance.
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They are often used in clinical trials to compare the benefits of drugs, and many times patients taking placebos show some improvement.
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Lilly said an investigational, phase II study showed that patients using its drug designated LY2140023 had statistically significant improvement versus those taking placebos.
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More than twice as many patients taking the 100-milligram pills dropped out of the trials due to side effects, including nausea, than those taking placebos.