Hisashi Moriguchi was besieged by reporters after giving a press conference retracting his claims.

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Rarely has such a spectacular scientific claim been debunked so rapidly. For a few brief hours last week, Hisashi Moriguchi, a project researcher at the University of Tokyo, was riding high, lauded by his nations press for pioneering work on induced pluripotent stem (iPS) cells. His feat was said to be the first successful use in humans of a technology that days earlier had won his countryman, Kyoto Universitys Shinya Yamanaka, a share of the Nobel Prize in Physiology or Medicine1.

Yet a swift investigation by Nature and several stem-cell researchers found that Moriguchis claim to have cured six heart-failure patients with cells derived from iPS cells was untrue; that he had lied about his university affiliations; and that he had plagiarized key parts of his research papers2. At a hastily convened press conference on 13 October, Moriguchi recanted. I admit that I lied, he told reporters, adding that his career as a researcher is probably over.

The sad episode could be written off as one researchers runaway fantasy. But it highlights the febrile nature of the iPS-cell field, particularly in Japan. Many researchers fear that the therapeutic promise of these cellswhich could open the way to creating replacement tissues to treat diseasewill spur a premature rush to clinical applications before their safety and efficacy can be proven.

The story kicked off when Moriguchis claims were splashed over the front page of Yomiuri Shimbunthe highest-circulation newspaper in the worldon 11October. He described how he had reprogrammed patients liver cells into an embryonic state, with the potential to develop into many different cell types. After converting these iPS cells into heart-muscle cells, he supposedly injected them into six patients in the United States to successfully repair their damaged heart tissue.

But inconsistencies in the account quickly became apparent. Alerted by Nature, Harvard Medical School and the Massachusetts General Hospital, both in Boston, denied that the procedures had taken place there, or that Moriguchi was affiliated with them, as he had claimed. In an interview with Nature, Moriguchi could not provide details of the ethics review board that had approved the procedures; the source of the clinical-grade cells; or the names of collaborators. He claimed to have carried out an incredible range of activities almost single-handedly and described unconventional and unlikely methods for producing the cells. Yet he trained as a nurse, lacks a medical degree, and his most recent research was in medical economics. Nature also discovered that the publications that Moriguchi had used to support his claims3, 4 contained technical images copied from other sources, as well as plagiarized passages from other articles5, 6. We are all doing similar things, so it makes sense that wed use similar words, Moriguchi told Nature.

On 13 October, the day after Nature ran its expos2, Moriguchi held a press conference in New York, where he had been attending a meeting of the New York Stem Cell Foundation. He admitted that most of his claims were untrue, but maintained that he had injected iPS-cell-derived heart cells into one patient, and that he could produce notes to prove it. The University of Tokyo and the Tokyo Dental and Medical University, where Moriguchi claimed to have carried out collaborative studies, have subsequently launched investigations into the affair. Nature Publishing Group, which has published papers by Moriguchi in its journal Scientific Reports, says that it is aware of the issues surrounding these publications and is investigating.

Researchers trying to understand why Moriguchi would engage in such reckless fabrication have noted a climate that allows such claims to gain prominence with little challenge. Since Yamanakas discovery of iPS cells in 2006, some Japanese media and government officials have taken a highly competitive tone about the technology. In its original article about Moriguchis claims, Yomiuri Shimbun noted that a burdensome regulatory system was holding back Japans clinical research relative to the United States, and, in a 2009 correspondence published in Nature7, Moriguchi argued that Japan is in danger of being overtaken in the field of human iPS-cell research.

Scientists, journalists and regulators here need to be especially careful not to let their pride in Yamanakas achievement affect their critical faculties, or overwhelm them in national fervour, says Douglas Sipp, who researches stem-cell ethics and regulation at the RIKEN Center for Developmental Biology in Kobe, Japan.

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Stem-cell fraud hits febrile field