What is the mechanism of action of fostatinib? How does it act on cancer cells?

Fostamatinib is an oral Syk (non-receptor tyrosine kinase) inhibitor that mainly regulates immune responses and cell signaling by inhibiting the activity of Syk kinase. It has been developed to treat some autoimmune diseases and some malignant tumors, especially showing certain potential in the treatment of cancers with immune escape mechanisms. The mechanism of action of fostatinib involves the regulation of immune cell function and changes in the tumor cell microenvironment.

The main mechanism of action of fostatinib is to inhibit Syk kinase. Syk is an important signal transduction molecule that plays a central role in the activation and proliferation of immune cells and various other cell types. In the tumor microenvironment, Syk kinase plays an important role in immune evasion, tumor cell migration, and angiogenesis. By inhibiting Syk, fostatinib can reduce the activity of these signaling pathways that are beneficial to tumor growth and spread, and interfere with the biological behavior of tumors.

Fostatinib affects immune cell function by inhibiting Syk kinase. In the tumor microenvironment, immune cells such as macrophages and T cells may be activated through the Syk pathway, thereby helping tumor cells evade host immune surveillance. Fostatinib helps restore the normal function of the immune system by reducing the overactivation of immune cells, allowing the immune system to more effectively identify and attack tumor cells.
The direct effect of fostatinib on tumor cells cannot be ignored. By inhibiting Syk, fostatinib can affect the proliferation, migration and invasion capabilities of tumor cells. Studies have shown that fostatinib can slow down the growth rate of tumor cells and reduce their ability to spread in the blood, thereby reducing the risk of tumor metastasis. In addition, fostatinib may further inhibit tumor growth and spread by regulating angiogenesis in the tumor microenvironment.
Reference: https://www.tavalisse.com/