What is the mechanism of action of Osimertinib (Tagressa)?

Osimertinib (Tagrisso) is a targeted therapy drug for non-small cell lung cancer (NSCLC). Its mechanism of action mainly involves the inhibition of epidermal growth factor receptor (EGFR). EGFR is a protein located on the cell surface. It belongs to the receptor tyrosine kinase family and is involved in regulating biological processes such as cell growth, differentiation and survival.

In some NSCLC patients, the EGFR gene is mutated, causing EGFR activity to be abnormally enhanced, thereby promoting abnormal proliferation and growth of tumor cells. The mechanism of action of Osimertinib (Tagressa) is closely related to this. It blocks abnormal signaling pathways by selectively inhibiting the activity of EGFR, thus inhibiting the growth and spread of tumor cells and reducing tumor progression and deterioration.

Compared with traditionalEGFRinhibitors,osimertinib (Tagrisso) has higher selectivity and stronger anti-tumor activity, especially for some patients with specific EGFR mutationsNSCLCPatients, such as first- and second-generation EGFRmutations that cannot be effectively treated by T790M inhibitors. T790Mmutation is one of the main reasons that cause NSCLC patients to become resistant to other EGFR inhibitors, and osimertinib (Tagressa) can effectively overcome this resistance, allowing patients to obtain longer survival and better treatment effects.

In addition,osimertinib (Tagressa)also shows good efficacy against central nervous system (CNS) metastases. Its high blood-brain barrier permeability enables it to effectively cross the blood-brain barrier and inhibit or delay the progression of brain metastases.

In general, Osimertinib (Tagressa) inhibits the growth and spread of tumor cells by inhibiting EGFR activity and blocking abnormal signaling pathways, thereby inhibiting the growth and spread of tumor cells. It is a targeted therapy drug that provides an effective treatment option for EGFR mutant NSCLC patients, bringing better treatment results and quality of life.