Metastatic profiling of HER2-positive breast cancer cell lines in xenograft models

Most studies on breast cancer metastasis have been performed using triple-negative breast cancer (TNBC) cells; thus, subtype-dependent metastatic ability of breast cancer is poorly understood. In this research, we performed intravenous injection (IVI) and intra-caudal arterial injections (CAI) using nine human epidermal growth factor receptor-2 (HER2)-positive breast cancer cell lines for evaluating their metastatic abilities. Our results showed that MDA-MB-453, UACC-893, and HCC-202 had strong bone metastatic abilities, whereas HCC-2218 and HCC-1419 did not show bone metastasis. HER2-positive cell lines could hardly metastasize to the lung through IVI. From the genomic analysis, gene signatures were extracted according to the breast cancer subtypes and their metastatic preferences. The UACC-893 cell line was identified as a useful model for the metastasis study of HER2-positive breast cancer. Combined with our previous result on brain proliferation ability, we provide a characteristic metastasis profile of HER2-positive breast cancer cell lines in this study. Statements and DeclarationsO_ST_ABSFundingC_ST_ABSThis study was supported by JSPS KAKENHI (grant no. 18K16269: Grant-in-Aid for Early-Career Scientist to J.N.; grant no. 20J01794, Grant-in-Aid for JSPS fellows to J.N.; grant no. 20J23297, Grant-in-Aid for JSPS fellows to Y.H.) and partially supported by the grants for translational research programs from Fukushima Prefecture (S.W. and K.S.). AuthorshipYH and KA performed the in vivo experiments and bioinformatical analyses. SW, and KS interpreted the data. YH, KA, and JN wrote the manuscript. JN conceived and designed the study. All the authors reviewed and edited the manuscript. Competing InterestsThe authors declare that they have no competing interests. Ethical approvalThe animal experiments were conducted under the approval of the ethics committee of Waseda University (2020-A067, 2021-A074).