Epithelial mesenchymal transition initiates precancer states in BRCA1 mutation carriers.

Cytokine-induced epithelial-mesenchymal transition (EMT) in BRCA1 carrier mammary organoids — early genomic instability and PARPi sensitivity

Patient-derived normal mammary organoids from BRCA1 heterozygous carriers and non-carriers were perturbed with inflammatory cytokines. While both groups developed CNVs and oncogenic mutations, BRCA1 carrier organoids specifically underwent EMT — with morphological, transcriptomic, and functional signatures, basal phenotype transition, and DNA damage accumulation. EMT-primed precancerous states showed PARP inhibitor sensitivity, suggesting a targetable vulnerability window in normal BRCA1 carrier tissue before frank malignancy.

Synthesis written by Geno'X. For the full original abstract, please refer to the source publication.

The concept of an early therapeutic window in normal BRCA1 carrier mammary tissue — before malignant transformation — is a biologically fascinating prospect. PARPi sensitivity of EMT-primed precancerous states opens a discussion on targeted chemoprevention strategies. However, these results are preprint and require independent validation before clinical extrapolation.

Clinical impact : 2/3 · Evidence strength : 2/3 · Novelty : 2/2 · Sample size : 0/1 · Journal quality : 0/1 · Preprint penalty : -1 → Total : 5/10