» Articles » PMID: 22011930

Lapatinib Distribution in HER2 Overexpressing Experimental Brain Metastases of Breast Cancer

Abstract

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.

Citing Articles

Molecular heterogeneity and MYC dysregulation in triple-negative breast cancer: genomic advances and therapeutic implications.

Priya , Kumar A, Kumar D 3 Biotech. 2025; 15(1):33.

PMID: 39777154 PMC: 11700964. DOI: 10.1007/s13205-024-04195-0.


Retrospective Analysis of Pyrotinib-Based Therapy for Metastatic Breast Cancer: Promising Efficacy in Combination with Trastuzumab.

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.


Brain-targeted drug delivery - nanovesicles directed to specific brain cells by brain-targeting ligands.

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.


Breaking Barriers in Neuro-Oncology: A Scoping Literature Review on Invasive and Non-Invasive Techniques for Blood-Brain Barrier Disruption.

Pinkiewicz M, Pinkiewicz M, Walecki J, Zaczynski A, Zawadzki M Cancers (Basel). 2024; 16(1).

PMID: 38201663 PMC: 10778052. DOI: 10.3390/cancers16010236.


References
1.
Sutherland S, Ashley S, Miles D, Chan S, Wardley A, Davidson N . Treatment of HER2-positive metastatic breast cancer with lapatinib and capecitabine in the lapatinib expanded access programme, including efficacy in brain metastases--the UK experience. Br J Cancer. 2010; 102(6):995-1002. PMC: 2844035. DOI: 10.1038/sj.bjc.6605586. View

2.
Rusnak D, Affleck K, Cockerill S, Stubberfield C, Harris R, Page M . The characterization of novel, dual ErbB-2/EGFR, tyrosine kinase inhibitors: potential therapy for cancer. Cancer Res. 2001; 61(19):7196-203. View

3.
Wood E, Truesdale A, McDonald O, Yuan D, Hassell A, Dickerson S . A unique structure for epidermal growth factor receptor bound to GW572016 (Lapatinib): relationships among protein conformation, inhibitor off-rate, and receptor activity in tumor cells. Cancer Res. 2004; 64(18):6652-9. DOI: 10.1158/0008-5472.CAN-04-1168. View

4.
Lockman P, Mittapalli R, Taskar K, Rudraraju V, Gril B, Bohn K . Heterogeneous blood-tumor barrier permeability determines drug efficacy in experimental brain metastases of breast cancer. Clin Cancer Res. 2010; 16(23):5664-78. PMC: 2999649. DOI: 10.1158/1078-0432.CCR-10-1564. View

5.
Stemmler H, Schmitt M, Willems A, Bernhard H, Harbeck N, Heinemann V . Ratio of trastuzumab levels in serum and cerebrospinal fluid is altered in HER2-positive breast cancer patients with brain metastases and impairment of blood-brain barrier. Anticancer Drugs. 2006; 18(1):23-8. DOI: 10.1097/01.cad.0000236313.50833.ee. View