Varlitinib Tosylate

**Semantic type:** Pharmacologic Substance

**Definition:** The tosylate salt form of varlitinib, an orally bioavailable inhibitor of the epidermal growth factor receptor family with potential antineoplastic activity. Varlitinib selectively and reversibly binds to both EGFR (ErbB-1) and Her-2/neu (ErbB-2) and prevents their phosphorylation and activation, which may result in inhibition of the associated signal transduction pathways, inhibition of cellular proliferation and cell death. EGFR and Her-2 play important roles in cell proliferation and differentiation and are upregulated in various human tumor cell types. Due to the dual inhibition of both EGFR and Her-2, this agent may be therapeutically more effective than agents that inhibit EGFR or Her-2 alone.

**Synonyms:** - 4,6-Quinazolinediamine, N(Sup 4)-(3-Chloro-4-(2-Thiazolylmethoxy)Phenyl)-N(Sup 6)-((4r)-4,5-Dihydro-4-Methyl-2-Oxazolyl)-, 4-Methylbenzenesulphonate (1:2) - 4-N-(3-Chloro-4-(Thiazol-2-Ylmethoxy)Phenyl)-6-N-((4r)-4-Methyl-4,5-Dihydrooxazol-2- Yl)Quinazoline-4,6-Diamine Bis(4-Methylbenzenesulphonate) - AR00334543 Ditosilate - AR00334543 Ditosylate - ARRY-334543 Ditosylate - ARRY-543 Ditosilate - ARRY-543 Ditosylate - VARLITINIB TOSYLATE