Why do willing, eligible patients disappear before they enroll in a clinical trial?
When a patient drops off before enrolling, it is easy to assume they were never serious. Often, that is not what happened. This Health Literacy Month, it is worth naming the quieter reason interested patients walk away: they could not tell whether the clinical trial was relevant to them, what participation would involve, or whether taking the next step was worth it.
Nearly 9 in 10 US adults don’t have proficient health literacy (National Assessment of Adult Literacy, US Department of Education). In Antidote's survey of almost 4,000 patients, the ones who understood clinical research were twice as likely to say they would take part. Interest was not the dividing line. Understanding was.
The drop-off you cannot see on a dashboard
A protocol is written for researchers and regulators. When that same language reaches a patient as an advertisement, a landing page, or a pre-screening questionnaire, an interested patient can hit friction before they ever reach a clinical site. They may decide the clinical trial is not for them and leave. The clinical site may never know why.
That is what makes this loss so easy to miss. It happens before any funnel report can catch it. A campaign can look healthy on impressions and clicks while the patients who could not read it quietly fall away.
Not every patient who drops off has lost interest. Some never understood clearly enough to take the next step.
Interest was never the barrier
Patients are not staying away because they do not care. In our survey, they told us the opposite. They want the industry to make clinical trials easier to understand, and they trust a real person or a fellow patient far more than an advertisement. Give them plain language from a source they trust, and willing patients move forward. Bury the opportunity in clinical terminology, and they disappear.
And the first click is only one place where comprehension can break down. The same friction can appear during pre-screening, follow-up, and the eventual clinical site handoff.
Frequently asked questions
How does health literacy affect clinical trial enrollment?
Comprehension, not interest, often decides who enrolls. When patient-facing materials are hard to read, willing and eligible patients cannot tell they qualify, so they leave before a clinical site ever sees them.
Why do eligible patients drop off before enrolling?
Many never enrolled to begin with. They disqualified themselves earlier, at the advertisement or the pre-screening questionnaire, because the language was written for researchers rather than patients.
When is Health Literacy Month?
Health Literacy Month takes place every October and has been recognized since 1999.
