Mr. James Lu, President of JAJ International, Inc. based in southern California (USA) and specializing in the development and sales of immunodiagnostic reagents, visited the Chinese National Compound Library (CNCL) in the afternoon of June 19, 2017. He was warmly received by Professor Ming-Wei Wang, Director of the National Center for Drug Screening/Chinese National Compound Library and Dean, School of Pharmacy, Fudan University. They conducted an in-depth discussion about development, application and prospect of “companion” diagnostics.