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Ref Type Journal Article
PMID (36011019)
Authors Ku GC, Chapdelaine AG, Ayrapetov MK, Sun G
Title Identification of Lethal Inhibitors and Inhibitor Combinations for Mono-Driver versus Multi-Driver Triple-Negative Breast Cancer Cells.
URL
Abstract Text There are no signaling-based targeted therapies for triple-negative breast cancer. The development of targeted cancer therapy relies on identifying oncogenic signaling drivers, understanding their contributions to oncogenesis and developing inhibitors to block such drivers. In this study, we determine that DU-4475 is a mono-driver cancer cell line relying on BRAF and the mitogen-activated protein kinase pathway for viability and proliferation. It is fully and lethally inhibited by BRAF or Mek inhibitors at low nM concentrations, but it is resistant to inhibitors targeting other signaling pathways. The inhibitory lethality caused by blocking Mek or BRAF is through apoptosis. In contrast, MDA-MB-231 is a multi-driver triple-negative breast cancer cell line dependent on both Src and the KRAS-activated mitogen-activated kinase pathway for proliferation and viability. Blocking each pathway alone only partially inhibits cell proliferation without killing them, but the combination of dasatinib, an Src inhibitor, and trametinib, a Mek inhibitor, achieves synthetic lethality. The combination is highly potent, with an IC50 of 8.2 nM each, and strikingly synergistic, with a combination index of less than 0.003 for 70% inhibition. The synthetic lethality of the drug combination is achieved by apoptosis. These results reveal a crucial difference between mono-driver and multi-driver cancer cells and suggest that pharmacological synthetic lethality may provide a basis for effectively inhibiting multi-driver cancers.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
BRAF V600E triple-receptor negative breast cancer sensitive Binimetinib Preclinical - Cell culture Actionable In a preclinical study, Mektovi (binimetinib) treatment inhibited Mapk signaling and viability in a triple-negative breast cancer cell line harboring BRAF V600E in culture (PMID: 36011019). 36011019
BRAF V600E triple-receptor negative breast cancer sensitive Dabrafenib Preclinical - Cell culture Actionable In a preclinical study, Tafinlar (dabrafenib) treatment inhibited Mapk signaling and viability in a triple-negative breast cancer cell line harboring BRAF V600E in culture (PMID: 36011019). 36011019
BRAF V600E triple-receptor negative breast cancer sensitive Trametinib Preclinical - Cell culture Actionable In a preclinical study, Mekinist (trametinib) treatment inhibited Mapk signaling and viability in a triple-negative breast cancer cell line harboring BRAF V600E in culture (PMID: 36011019). 36011019