Health officials said they were questioning researchers after being told false data was used in clinical testing for the USD 28 million government-backed Alzheimer's study, aimed at improving diagnosis of the disease.
The research involved 11 drugs firms, including Pfizer and Bristol-Myers Squibb and Japanese giants Takeda Pharmaceutical and Astellas Pharma, medical imaging companies and nearly 40 hospitals and medical organisations. The public and privately-financed study, dubbed J-ADNI, began in 2007.
A former Tokyo University professor and project researcher on the Alzheimer's study reported the false data claims to health officials. Novartis was not involved in the study.
"After verifying the facts about these allegations, we will deal with the issue appropriately, setting up an investigation team if necessary," a health ministry official told AFP.
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A report in the Asahi Shimbun today said the newspaper had obtained internal documents highlighting at least four instances where researchers linked to the drugs makers and medical institutions tried to falsify data.
In response, a Pfizer spokesman in Japan said the drugs giant supplied some financing for the research, but did not employ any researchers.
Others firms could not immediately be reached for comment.
Health officials lodged the unrelated claims against Novartis months after a university said data in clinical studies might have been skewed to falsely promote Diovan, which is also known as Valsartan, in the prevention of stroke and angina.