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Tamoxifen-Resistant MCF7 Breast Cancer Cells (MCF7/TAMR-4)

Tamoxifen-Resistant MCF7 Breast Cancer Cells (MCF7/TAMR-4)

Product Code: ax4011 Categories: , , .

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MCF7/TAMR-4 and MCF7/TAMR-8 are tamoxifen-resistant MCF7 breast cancer cell lines. The parental MCF7/S0.5 line was treated with 1 μM tamoxifen for 28 days which killed the majority of the cells. The surviving cells were clonally expanded as sublines in the absence of tamoxifen for 19 passages and were then treated continuously with 1 μM tamoxifen. The resistant cells continued to proliferate and approached a growth rate that was comparable to the parental MCF7/S0.5 line.

Condition of sale: the end user is not permitted to transfer or re-freeze the cells.

Product Specification

Donor gender Female
Donor age at sampling 69 yrs
Genetic modification None
Size 1 million cells
Growth properties Adherent
Disease information Malignant adenocarcinoma derived from pleural effusion
General notes Expresses the estrogen receptor (ER); resistant to tamoxifen at 1 μM
Shipping conditions Dry ice
Storage conditions vapour phase nitrogen
Usage notes Culture in DMEM/F12 medium (no phenol red) supplemented with 1% fetal bovine serum + 2.5 mM GlutaMAX + 6 ng/mL insulin. Addition of 1 μM tamoxifen is required to maintain a high level of resistance
Condition of sale The end user is not permitted to transfer or re-freeze the cells

Technical Resources


  • Sarwar N, Kim JS, Jiang J et al. Phosphorylation of ERalpha at serine 118 in primary breast cancer and in tamoxifen-resistant tumours is indicative of a complex role for ERalpha phosphorylation in breast cancer progression. Endocrine-related Cancer (2006)
  • Cutrupi S, Reineri S, Panetto A et al. Targeting of the adaptor protein Tab2 as a novel approach to revert tamoxifen resistance in breast cancer cells. Oncogene (2012)
  • Pancholi S, Lykkesfeldt AE, Hilmi C et al. ERBB2 influences the subcellular localization of the estrogen receptor in tamoxifen-resistant MCF-7 cells leading to the activation of AKT and RPS6KA2. Endocrine-related Cancer (2008)
  • Millour J, Constantinidou D, Stavropoulou AV et al. FOXM1 is a transcriptional target of ERalpha and has a critical role in breast cancer endocrine sensitivity and resistance. Oncogene (2010)
  • Elias D, Vever H, Lænkholm AV et al. Gene expression profiling identifies FYN as an important molecule in tamoxifen resistance and a predictor of early recurrence in patients treated with endocrine therapy. Oncogene (2015)
  • Joshi T, Elias D, Stenvang J et al. Integrative analysis of miRNA and gene expression reveals regulatory networks in tamoxifen-resistant breast cancer. Oncotarget (2016)
  • Thrane S, Lykkesfeldt AE, Larsen MS et al. Estrogen receptor α is the major driving factor for growth in tamoxifen-resistant breast cancer and supported by HER/ERK signaling. Breast Cancer Research and Treatment (2013)
  • Larsen MS, Yde CW, Christensen IJ et al. Carboplatin treatment of antiestrogen-resistant breast cancer cells. International Journal of Oncology (2012)
  • Pedersen AM, Thrane S, Lykkesfeldt AE et al. Sorafenib and nilotinib resensitize tamoxifen resistant breast cancer cells to tamoxifen treatment via estrogen receptor α. International Journal of Oncology (2014)
  • Thrane S, Pedersen AM, Thomsen MB et al. A kinase inhibitor screen identifies Mcl-1 and Aurora kinase A as novel treatment targets in antiestrogen-resistant breast cancer cells. Oncogene (2015)