Overcoming the Greatest Barriers in Rare Disease Patient Recruitment

Every missed patient in a rare disease clinical trial represents more than a recruitment challenge, it represents a missed opportunity to advance research for communities with limited treatment options. With more than 10,000 known rare diseases and only a small percentage with approved treatments, the need for continued research is clear. However, unmet need alone does not guarantee patient awareness, interest, or enrollment.

Rare disease recruitment is often shaped by five core barriers:

• Low Awareness

• Complex Protocols

• Competitive Trial Landscape

• Patient Hesitancy

• Logistical or Physical Limitations

Addressing these challenges requires more than a single tactic. It requires a tailored recruitment and retention strategy that identifies, educates, and supports patients throughout the recruitment journey.

Awareness remains one of the largest barriers in rare disease research. Patients, caregivers, and even healthcare providers may not recognize symptoms, connect those symptoms to a specific condition, or know that a clinical trial is available. Digital recruitment, search and social media strategies, trial websites, advocacy partnerships, and healthcare provider outreach can help reach patients where they are already looking for answers and guide them toward appropriate study sites.

Complex protocols and restrictive eligibility criteria can make trial participation difficult for patients to fully understand. Patient-friendly education, online pre-screening, study videos, brochures, and clear site talking points can reduce uncertainty and help potential participants understand what to expect. These tools also allow sites to focus their time on the most qualified and informed referrals.

Rare disease trials frequently compete for a limited patient population, making differentiation essential. Strong study branding, a targeted digital presence, patient-centered messaging, and early engagement with advocacy groups can help a study stand out in a crowded environment. Just as importantly, these efforts can help build trust and connect with patients before competing trials do.

Patient hesitancy is another significant barrier. For many rare disease patients, joining a trial may mean reconsidering a treatment routine that took years to establish. Transparent, empathetic conversations around risks, potential benefits, placebo, study expectations, available data, and how the investigational product may address an unmet need can help patients make informed decisions with greater confidence.

Even when patients are interested, physical, financial, and logistical limitations can prevent participation. Travel distance, mobility needs, caregiver responsibilities, and reimbursement concerns can make study visits feel inaccessible. Patient concierge services—including customized travel, lodging, meal reimbursement, stipends, and caregiver support—can reduce these burdens and create a more supportive trial experience.

There is no one-size-fits-all approach to rare disease recruitment. The most effective strategies combine awareness-building, education, differentiated outreach, trust-building, and patient support to meet patients at multiple touchpoints. By aligning recruitment tactics with the real-world needs of patients, caregivers, and sites, study teams can improve the likelihood of identifying eligible participants and supporting them through the trial journey.

Patient recruitment and retention remain some of the most challenging hurdles in clinical development. A well-vetted feasibility and recruitment strategy coupled with focused patient recruitment and retention teams sets Sponsors up for expedited enrollment and reduced patient dropouts. Medpace’s IntelliPACE ® model synthesizes data from both internal and external data sources to guide the selection of the best countries and sites for study participation. This data is further refined through Medpace expert analysis and input from sites and Key Opinion Leaders to align the target patient population with high-performing investigative sites.

Once the optimal strategy is defined, our specialized Patient Recruitment and Retention team steps in to execute the plan seamlessly and efficiently through our ExcelliPACE ® . Through this process we ensure that patients and caregivers are supported throughout their clinical trial experience by focusing on awareness and education; comfort and convenience; and providing technology to support participation.

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