Tyrphostin AG 99是一种有效的，细胞可渗透的，可逆的EGFR（表皮生长因子受体）和EGF依赖性细胞增殖抑制剂。EGFR的刺激导致肿瘤的生长和增殖，抑制细胞凋亡，刺激血管生成并促进组织的侵袭和转移。Tyrphostin AG 99已显示抑制EGFR磷酸化以及ERK1和ERK2活性。 Tyrphostin AG 99 is a potent, cell-permeable, reversible inhibitor of EGFR (epidermal growth factor receptor) and EGF-dependent cell proliferation. Stimulation of EGFRs result in tumor growth and proliferation, inhibition of apoptosis, stimulation of angiogenesis and the promotion of tissue invasion and metastasis. Tyrphostin AG 99 has been shown to inhibit EGFR phosphorylation and ERK1 and ERK2 activities.