Cell Stem Cell
Volume 7, Issue 3, 3 September 2010, Pages 403-417
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Article
BRCA1 Basal-like Breast Cancers Originate from Luminal Epithelial Progenitors and Not from Basal Stem Cells

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Summary

Breast cancers in BRCA1 mutation carriers frequently have a distinctive basal-like phenotype. It has been suggested that this results from an origin in basal breast epithelial stem cells. Here, we demonstrate that deleting Brca1 in mouse mammary epithelial luminal progenitors produces tumors that phenocopy human BRCA1 breast cancers. They also resemble the majority of sporadic basal-like breast tumors. However, directing Brca1 deficiency to basal cells generates tumors that express molecular markers of basal breast cancers but do not histologically resemble either human BRCA1 or the majority of sporadic basal-like breast tumors. These findings support a derivation of the majority of human BRCA1-associated and sporadic basal-like tumors from luminal progenitors rather than from basal stem cells. They also demonstrate that when target cells for transformation have the potential for phenotypic plasticity, tumor phenotypes may not directly reflect histogenesis. This has important implications for cancer prevention strategies.

Highlights

BRCA1 breast cancers have been suggested to develop in basal mammary stem cells ► Targeted Brca1 loss in stem cells did not generate human BRCA1-like tumors ► Brca1 loss in luminal progenitors produced tumors identical to human cancers ► Luminal progenitors are probably the true origin of human BRCA1 breast cancers

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