Dear Editor,The April 2014 issue of Theoretical Medicine and Bioethics [1] presented eight essays regarding the use of nonhuman animals in biomedical research. While I appreciate the essays concerning contemporary research—which were well written and offered new thinking from the fields of ethics and ethology—I believe the journal, via the topics and the authors chosen, failed to communicate the most important fact regarding the current science pertinent to the use of nonhuman animals in research.The foundational reason for using chimpanzees and (...) other animals in research is their predictive value for human response to drugs and disease. This was alluded to by several of the authors when they discussed the necessity of using nonhuman animals. For example, Smith writes: “A common assumption in the selection of nonhuman animal subjects for research and the approval of research is that, if the risks of a procedure are too great for humans, and if there is a so-called scientific necessity, .. (shrink)