Home >
Publications >
GATA3 and MDM2 are synthetic lethal in estrogen receptor-positive breast cancers

GATA3 and MDM2 are synthetic lethal in estrogen receptor-positive breast cancers

19 Apr 2022Communications Biology

DOI : 10.1038/s42003-022-03296-x

Authors

Gaia Bianco, Mairene Coto-Llerena, John Gallon, Venkatesh Kancherla, Stephanie Taha-Mehlitz, Mattia Marinucci, Martina Konantz, Sumana Srivatsa, Hesam Montazeri, Federica Panebianco, Vijaya G. Tirunagaru, Marta De Menna, Viola Paradiso, Caner Ercan, Ahmed Dahmani, Elodie Montaudon, Niko Beerenwinkel, Marianna Kruithof-de Julio, Luigi M. Terracciano, Claudia Lengerke, Rinath M. Jeselsohn, Robert C. Doebele, François-Clément Bidard, Elisabetta Marangoni, Charlotte K. Y. Ng, Salvatore Piscuoglio

Abstract

Synthetic lethal interactions, where the simultaneous but not individual inactivation of two genes is lethal to the cell, have been successfully exploited to treat cancer. GATA3 is frequently mutated in estrogen receptor (ER)-positive breast cancers and its deficiency defines a subset of patients with poor response to hormonal therapy and poor prognosis. However, GATA3 is not yet targetable. Here we show that GATA3 and MDM2 are synthetically lethal in ER-positive breast cancer. Depletion and pharmacological inhibition of MDM2 significantly impaired tumor growth in GATA3-deficient models in vitro, in vivo and in patient-derived organoids/xenograft (PDOs/PDX) harboring GATA3 somatic mutations. The synthetic lethality requires p53 and acts via the PI3K/Akt/mTOR pathway. Our results present MDM2 as a therapeutic target in the substantial cohort of ER-positive, GATA3-mutant breast cancer patients. With MDM2 inhibitors widely available, our findings can be rapidly translated into clinical trials to evaluate in-patient efficacy.