Cancer vaccines are necessary. Cancer vaccine is an effective way to treat tumors and the most ideal treatment in clinical practice. The country advocates prevention of diseases and strongly promotes the application of cancer vaccines to treat tumors. Due to the development of technology, some cancer vaccines have been able to achieve complete clinical cure or even complete elimination of certain tumors in the cancer treatment world. For example, the cervical cancer vaccine has allowed a rapid reduction in the incidence of cervical cancer patients. Meanwhile, nowadays, technology has developed, and many companies are also developing lung cancer vaccines, breast cancer vaccines, ovarian cancer vaccines, etc. in clinical practice. It is believed that in the near future, the launch of these vaccines will enable the cancer incidence rate in China to be reduced rapidly and significantly.