Lapatinib Distribution in HER2 Overexpressing Experimental Brain Metastases of Breast Cancer
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Purpose: Lapatinib, a small molecule EGFR/HER2 inhibitor, partially inhibits the outgrowth of HER2+ brain metastases in preclinical models and in a subset of CNS lesions in clinical trials of HER2+ breast cancer. We investigated the ability of lapatinib to reach therapeutic concentrations in the CNS following (14)C-lapatinib administration (100 mg/kg p.o. or 10 mg/kg, i.v.) to mice with MDA-MD-231-BR-HER2 brain metastases of breast cancer.
Methods: Drug concentrations were determined at differing times after administration by quantitative autoradiography and chromatography.
Results: (14)C-Lapatinib concentration varied among brain metastases and correlated with altered blood-tumor barrier permeability. On average, brain metastasis concentration was 7-9-fold greater than surrounding brain tissue at 2 and 12 h after oral administration. However, average lapatinib concentration in brain metastases was still only 10-20% of those in peripheral metastases. Only in a subset of brain lesions (17%) did lapatinib concentration approach that of systemic metastases. No evidence was found of lapatinib resistance in tumor cells cultured ex vivo from treated brains.
Conclusions: Results show that lapatinib distribution to brain metastases of breast cancer is partially restricted and blood-tumor barrier permeability is a key component of lapatinib therapeutic efficacy which varies between tumors.
Priya , Kumar A, Kumar D 3 Biotech. 2025; 15(1):33.
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Gu Q, Zhu M, Wang Y, Gu Y Breast Cancer (Dove Med Press). 2024; 16:253-268.
PMID: 38812479 PMC: 11135571. DOI: 10.2147/BCTT.S457845.
Moreira R, Nobrega C, de Almeida L, Mendonca L J Nanobiotechnology. 2024; 22(1):260.
PMID: 38760847 PMC: 11100082. DOI: 10.1186/s12951-024-02511-7.
Single-particle imaging of nanomedicine entering the brain.
Wei M, Qian N, Gao X, Lang X, Song D, Min W Proc Natl Acad Sci U S A. 2024; 121(5):e2309811121.
PMID: 38252832 PMC: 10835139. DOI: 10.1073/pnas.2309811121.
Pinkiewicz M, Pinkiewicz M, Walecki J, Zaczynski A, Zawadzki M Cancers (Basel). 2024; 16(1).
PMID: 38201663 PMC: 10778052. DOI: 10.3390/cancers16010236.