ABSTRACT
OBJECTIVE To provide information service support for research on proteolysis targeting chimera （PROTAC） in China and provide reference for technical development and patent layout of relevant drug research and development institutions. METHODS The patent analysis method was used to search the patent applications related to PROTAC technology that had been applied to China National Intellectual Property Administration and had been issued before Feb. 2022， using the HimmPat patent database as the search platform. The patent application trend， technology life cycle， main applicants， technology source countries， technology themes， improvement routes and other patent data were analyzed. RESULTS & CONCLUSIONS A total of 133 patents were included in this study. The patent application for PROTAC technology started relatively late in China， with the number of applicants increasing from 2 in 2015 to 30 in 2020， and the number of applications increasing from 2 in 2015 to 38 in 2020. Both the annual patent application volume and the number of applicants were in a period of rapid growth， but the average annual application volume of a single applicant was still less than 2， indicating that research in this field was still in the early stage of technology development； the number of applications from Arvinas， Hisco， and Hinova Pharmaceutical Inc. ranked among the top. Although the number of domestic applications led that of foreign applications in China， the average number of simple peer applications and the average number of simple peer countries in domestic patent applications was only 1.5， which was far lower than that of foreign applications in China， reflecting that there was still room for improvement in the “quality” level of domestic applications. The initial improvements in PROTAC technology mainly focused on the selection of E3 ligands， targets and ligands， and then new improvements such as new PROTAC development， linker design and matching methods emerged， indicating that the patent applicant had started a multi-track layout in the early stages of the development of PROTAC technology. It is suggested that the research and development of PROTAC drugs in China should focus on improving the oral bioavailability and biosafety of PROTAC drugs， overcoming potential drug resistance， and exploring rational design and evaluation methods.