Peer Reviewer Bias Pushes Researchers Toward Animal Experiments, Delaying Nonanimal Methods

A Physicians Committee report reveals systemic bias in peer review that pressures scientists to use animal testing, hindering adoption of innovative nonanimal research approaches.

Peer Reviewer Bias Pushes Researchers Toward Animal Experiments, Delaying Nonanimal Methods A Physicians Committee report reveals systemic bias in peer review that pressures scientists to use animal testing, hindering adoption of innovative nonanimal research approaches. The phenomenon, termed "animal methods bias," occurs when research is unfairly evaluated because it does not include animal experiments. Survey Findings and Bibliometric Analysis Catharine E. Krebs, director of medical research at the Physicians Committee for Responsible Medicine, led a study surveying 189 researchers using nonanimal methods. Half reported being asked by peer reviewers to add animal experiments to their studies. Most refused but faced negative consequences such as publishing in lower-impact journals, manuscript rejection, and publication delays. One-fifth admitted conducting unnecessary animal experiments solely to meet anticipated reviewer demands. The team also analyzed over 1.1 million publications from 2009 to 2023, confirming that animal studies were published at higher rates and in higher-impact journals than purely in vitro studies. Impact on Research Ecosystem Animal methods bias penalizes researchers using nonanimal methods and pushes them to conduct unnecessary animal experiments to secure publication. This slows the adoption of human-based approaches, limiting the dissemination of important findings and hindering scientific learning about nonanimal techniques. As governments shift research policies and funding toward human-based approaches, addressing this bias becomes critical. Mitigation Efforts and Recommendations Krebs leads the Coalition to Illuminate and Address Animal Methods Bias (COLAAB), which works with stakeholders across research, publishing, and government. The coalition recommends that research institutions de-emphasize journal impact factor and other metrics, which poorly represent research quality. Journal editors are also urged to intervene when reviewers request animal experiments. As a result of COLAAB outreach, two journals recently updated their policies to encourage nonanimal submissions and discourage reviewer requests for animal experiments. Researchers can consult COLAAB's Author Guide for Addressing Animal Methods Bias in Publishing. Nonanimal Alternatives Show Promise Humaneworld highlights successful nonanimal technologies, including lung organ-on-a-chip models that identified drug-induced fluid buildup in cancer patients, and intestinal organoids used to test treatments for cystic fibrosis. A nervous system organ-on-a-chip helped identify the cause of muscle weakness in chronic inflammatory demyelinating polyneuropathy (CIDP), leading to approval for human clinical trials. Brain organoids confirmed that the Zika virus causes microcephaly in babies, a finding impossible to replicate in animal experiments. These methods are faster, less expensive, and more accurate than traditional animal tests, with approximately 90% of medicines failing in human trials following animal testing.

Read source: Physicians Committee