Clinical trial participation remains a complex challenge in the United States, with a majority of patients interested but unable to enroll due to multiple hurdles, according to recent surveys and expert analyses. Key obstacles include geographic inaccessibility, financial burdens, and limited awareness fueled by insufficient provider engagement, prompting ongoing policy efforts aimed at expanding patient access and support.
What Happened
A recent online survey of over 2,000 adults with chronic conditions found that 71% would likely participate in clinical trials if given the chance, yet two-thirds reported that their healthcare providers had never discussed clinical trial opportunities with them. Another study analyzing 2020 data revealed that only 9% of adults have ever been invited to take part in a clinical trial. Challenges such as trial location, eligibility, and costs frequently prevent willing participants from enrolling. Recognizing these barriers, the U.S. Department of Health and Human Services in June announced initiatives to streamline clinical research and reconsider regulations that currently limit sponsor reimbursement for participant expenses like travel and lodging. Additionally, nearly 200 patient advocacy and public health groups pushed for the Senate to pass the Clinical Trial Modernization Act, which would allow sponsors to cover medical and nonmedical costs for participants and protect their eligibility for income-based aid programs by excluding support from federal taxation.
Key Facts
Up to 86% of clinical trials fail to meet recruitment targets within the designated time frame. In a 2019 study covering 8,893 cancer patients, 55.6% lacked a suitable trial at their treatment site, while 21.5% did not meet eligibility criteria for available trials. Despite 86% of primary care physicians indicating a willingness to refer patients, only 37% had ever done so, often prompted by patient inquiry, lack of response to standard treatments, or disease progression. Clinical trials often require frequent visits for monitoring, which poses a significant barrier for those living far from trial centers. While trial sponsors cover direct trial-related medical costs, patients usually remain responsible for deductibles, copays, and out-of-network charges. Nonmedical expenses such as travel, lodging, childcare, and lost wages further discourage participation. Efforts to decentralize trials and allow remote participation are in early stages but hold promise for expanding access.
What This Means
The data highlight a critical gap between patient willingness to enroll in clinical trials and their actual participation, reflecting structural issues in the U.S. clinical research ecosystem. Many patients remain unaware of trials or unable to participate due to logistical or financial constraints, which limits the representativeness of trial populations and slows medical progress. For individuals with serious illnesses like cancer, clinical trials may offer their best treatment options. Yet without accessible trial sites or financial support, those patients face lower odds of enrollment and the associated benefits of cutting-edge care and close monitoring.
Improving clinical trial participation is therefore not only a matter of patient education but also requires systemic changes including better integration of trial options into routine care, expanded insurance coverage policies, and financial safeguards that mitigate incidental costs. The proposed Clinical Trial Modernization Act and related government initiatives signal growing recognition of these issues and may reduce disparities in who can participate. Greater patient inclusion can accelerate the development of new therapies while ensuring trial findings apply broadly across diverse populations.
Background
Clinical trials are essential for testing new drugs, devices, preventive measures, or diagnostics before approval by the Food and Drug Administration. Participant recruitment and retention shape trial success but often prove difficult due to eligibility restrictions, geographic proximity to trial sites, and burdens of frequent monitoring visits. Under the Affordable Care Act, commercial insurers generally cover routine care costs during clinical trials, but patients still incur copays and deductibles. Medicare and Medicaid cover similar costs, though restrictions on out-of-network benefits persist. These factors collectively create financial toxicity that can discourage participation. Patient advocates have long called for reforms to address these barriers, with renewed momentum from the Department of Health and Human Services in 2023.
Analysis
Alan Balch, executive board chair at the Patient Advocate Foundation, emphasizes that every interaction in clinical trials presents potential access challenges, from initial recruitment to participant retention. Mark Fleury of the American Cancer Society Cancer Action Network points out that clinical trials may offer the only hope for improved outcomes in deadly diseases, underscoring the importance of equitable trial access. Wendy Selig, CEO of WSCollaborative, notes that incidental costs and lack of awareness about financial assistance contribute heavily to low enrollment and urges patients to proactively seek support. Experts agree that increased decentralization of trials could alleviate geographic barriers, but widespread adoption remains a work in progress.
What Comes Next
The U.S. Department of Health and Human Services continues its efforts to revamp clinical trial regulations, particularly around compensation for participant expenses. Lawmakers are moving forward with the Clinical Trial Modernization Act, pending Senate approval. Health advocacy groups and institutional stakeholders are collaborating on strategies to broaden trial accessibility through technology-enabled decentralized models and enhanced patient education. Monitoring the implementation and impact of these measures will be critical in addressing longstanding barriers to trial participation.
Sources
This article is based on reporting and publicly available information from the following sources:
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