Abstract
Financial conflicts of interest in medical research foster deviations from research standards and evidentially lead to the suppression of research findings that are at odds with commercial interests of pharmaceutical companies. Questionable research practices prevent data from being created, made available, or given suitable recognition. They run counter to codified principles of responsible conduct of research, such as honesty, openness or respect for the law. Resulting in ignorance, misrepresentation and suspension of scientific self-correction, suppression of medical evidence in its various forms is both a threat to the epistemic and the moral integrity of medical science. This paper discusses an example of the suppression of medical evidence in recent influenza research and develops a conceptual framework for the description and assessment of questionable research practices applied in research and publication processes to suppress evidence.