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HER2 Inhibitor SPH5030 is an orally bioavailable, irreversible inhibitor of the receptor tyrosine kinase human epidermal growth factor receptor 2 (HER2; ErbB2; HER-2), with potential antineoplastic activity. Upon oral administration, HER2 inhibitor SPH5030 selectively binds to and inhibits the activity of wild-type and various HER2 mutants. This prevents HER2-mediated signaling and may lead to cell death in HER2-expressing tumor cells. HER2, a receptor tyrosine kinase overexpressed on a variety of tumor cell types, plays an important role in tumor cell proliferation and tumor vascularization.