Neratinib maleate (HKI-272 maleate) is an irreversible, orally active and highly selective inhibitor of HER2 and EGFR with IC50 values of 59 nM and 92 nM, respectively.Neratinib maleate has antitumor activity and can be used to treat gastrointestinal, respiratory, genitourinary, and cutaneous and musculoskeletal diseases, and can be used to study breast and prostate cancer. used in the study of breast and prostate cancer.

EGFR:92 nM, HER2:59 nM

Neratinib maleate (0.5 ng/mL–5 μg/mL; 2 days) inhibits the proliferation of cell lines that show high levels of HER-2 (3T3/neu, SK-Br-3, and BT474 (7 days)) and is much less active in cell lines that express neither HER-2 nor EGFR (3T3, MDA-MB-435, and SW620).[1]
Neratinib maleate (0-2 nM; 12-16 h) arrests BT474 cell cycle at the G1-S phase.[1]
Neratinib maleate results in the inhibition of MAPK and Akt phosphorylation, down-regulation of cyclin D1 levels, and induction of p27.[1]

Neratinib maleate (HKI-272) (10, 20, 40, 60 or 80 mg/kg/day; i.g.; 42 days; Female athymic (nude) mice, tumor xenograft) reduced tumor growth in a dose-dependent manner in 3T3/neu, BT474, SK-OV-3, and A431 xenografts, but was o inactive in xenografts of MX-1 and MCF-7. Inhibited phosphorylation of HER-2 in BT474 xenografts. It shows anticancer activities against cancer cells that express high levels of HER-2 or EGFR.[1]