Conflict of Interest

A conflict of interest in research occurs when a researcher's financial, personal, professional, or institutional interests could compromise, or reasonably appear to compromise, the integrity, objectivity, or ethical conduct of their work. Conflicts of interest are not inherently wrong; what matters is whether they are disclosed and managed so that they do not bias the design, conduct, analysis, or reporting of research. Many journals, funding agencies, and institutions require formal disclosure of relevant potential conflicts.

Undisclosed conflicts of interest undermine public trust in science. A Cochrane methodology review of 75 papers found that industry sponsored drug and device studies more often reported favorable efficacy results (risk ratio 1.27, 95% CI 1.17 to 1.37) and favorable conclusions (risk ratio 1.34, 95% CI 1.19 to 1.51) than studies with other sponsors. When conflicts go undeclared, readers cannot properly evaluate whether the findings may have been influenced by competing interests. Conversely, transparent disclosure allows the scientific community to weigh evidence appropriately. Funding agencies may also have policies requiring conflict of interest management plans as a condition of grant awards. Failure to disclose can result in retraction, loss of funding, and reputational damage.

Researchers are typically required to complete conflict of interest disclosure forms at several stages: when submitting grant applications, when running a clinical trial (in the United States, clinical investigators on studies that support an FDA marketing application give the sponsor financial information and update it until one year after the study ends, under 21 CFR Part 54), and when submitting manuscripts for publication. These forms ask about financial relationships (consulting fees, equity holdings, patents, honoraria), personal relationships (family members employed by relevant entities), and academic interests (competing grants or intellectual commitments). Institutions usually have conflict of interest committees that review disclosures and determine whether a conflict needs to be eliminated, reduced, or simply disclosed. Journals publish conflict of interest statements alongside articles so readers can factor them into their assessment of the evidence.

Declare potential conflicts of interest in every research output: manuscripts, conference presentations, grant applications, and regulatory submissions. Even when you believe the conflict did not influence your work, transparency is the standard. It is also important to consider conflicts among co authors, not just the corresponding author. In systematic reviews and meta analyses, reviewers should extract and report the conflict of interest declarations from included studies, as these may explain heterogeneity in results.

A common mistake is failing to disclose a conflict because the researcher sincerely believes it did not affect their judgment. The standard for disclosure is the appearance of a potential conflict, not proof of actual bias. Another error is narrowly defining conflicts to include only direct financial payments while ignoring in kind support, unpaid advisory roles, or stock ownership by a spouse. Researchers sometimes assume that disclosing a conflict resolves the issue, but in some cases additional management steps are necessary, such as having an independent party oversee data analysis. Finally, journals vary in their disclosure requirements, and authors should check each journal's specific instructions rather than relying on a single standard form.

A physician scientist publishes a randomized trial comparing two anticoagulants. She discloses that she received consulting fees from the manufacturer of one drug and served on the advisory board of the company that makes the other. The journal publishes these declarations, allowing readers to consider whether the reported outcome of noninferiority might have been framed differently had these relationships not existed. An editorial accompanying the article notes the conflicts and encourages readers to await independent replication.