As new products come to market, Biotech will increasingly face commercialization and production issues. According to the analysis of the CRL issued by the FDA in 2009, some scholars have concluded that about 40% of the drugs were withdrawn due to CMC rectification, which is more common during the first and second phases of drug clinical trials, such as currently hot treatments. The new ADC drug Sacituzumab Govitecan for triple-negative breast cancer was issued a CRL by the FDA because of CMC, which ultimately affected its launch progress. There are always people who want to take shortcuts, but there are no shortcuts for CMC. We can only keep our feet on the ground and keep studying.