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Under the International Council for Harmonization (ICH)‐E1 guideline for drugs intended for chronic or repeated intermittent use in non‐life‐threatening diseases, data from 100 patients exposed for a minimum of 1 year are required to be included in the safety data base of a new drug application. In response to the recent globalization of drug development, the Ministry of Health, Labour, and Welfare of Japan requires that the data according to the ICH‐E1 guideline should be collected from 100 Japanese patients by the administrative notice of Basic Principles on Global Clinical Trials (reference cases) by considering ethnic differences in safety between Japanese and foreigners. In this study, we assessed Pharmaceuticals and Medical Devices Agency (PMDA) review reports of new drugs from 2016 to 2020 that include safety data for 100 Japanese patients exposed to these drugs for a minimum of 1 year to see if the study data led to the detection of Japanese‐specific safety issues. The result showed that the safety data from these patients provided only marginal value to identify Japanese‐specific safety issues, and no drugs were subjected to regulatory measures. Based on these studies and the fact that Japanese‐specific safety differences detected for a few drugs did not lead to adaptations of drug regulatory measures, we would like to propose not to make it a rule to collect safety data from 100 Japanese patients exposed at least 1 year, while keeping the ICH‐E1 guideline.

Assessment of the impact of Japanese‐specific long‐term safety data on new drug approval