Treatments that target cellular receptors, key genes and regulatory molecules are called “molecularly targeted therapies”. Molecularly targeted drugs are actually used to close the key receptors in the development of tumors and correct their pathological processes. The common features are: 1) targeted; 2) non-cytotoxic; 3) cellular regulation and stabilization; 4) the best biological dose available for clinical use, with no maximum tolerated dose; 5) the spectrum of toxic effects is very different from that of the commonly used cytotoxic drugs; 6) the combination with conventional radiotherapy may have better effects. Molecularly targeted drugs are not targeted to kill tumor cells, but to block molecules specifically expressed on tumor cell membranes or within cells, which not only can act more specifically on tumor cells to block their growth, metastasis or induce apoptosis, but also reduce the killing effect on normal cells at the same time.