Drugs are used to treat advanced colorectal cancer as it cannot be removed with surgery. The development of drugs has been remarkable in recent years. 25 years ago, there were only 2 types of drugs for treating colorectal cancer, but now there are 22 types. Specifically, it has become possible to analyze cancer at the genetic level and choose the most appropriate drug according to the type of cancer. Find out how molecular-targeted drugs help patients live much longer and drastically reduce serious side effects that require hospitalization.