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Ref Type Journal Article
PMID (27765850)
Authors Lu J, McEachern D, Li S, Ellis MJ, Wang S
Title Reactivation of p53 by MDM2 Inhibitor MI-77301 for the Treatment of Endocrine-Resistant Breast Cancer.
Abstract Text Endocrine therapy has been highly effective for the treatment of estrogen receptor-positive breast cancer, but endocrine resistance develops in a significant proportion of patients. In an effort to develop novel therapeutic strategies for the treatment of endocrine-resistant breast cancer, we have evaluated a potent and specific MDM2-p53 interaction inhibitor, MI-77301, which has been advanced into clinical development, for its therapeutic potential and mechanism of action in vitro and in vivo in WHIM9 and WHIM18 patient-derived xenograft (PDX) models. Both WHIM9 and WHIM18 PDX models exhibit estradiol-independent tumor growth and are resistant to fulvestrant, a highly effective and selective estrogen receptor degrader (SERD). MI-77301 activates wild-type p53 in WHIM9 and WHIM18 cells in vitro and in xenograft tumor tissues in vivo, and it effectively induces upregulation of p21 and cell-cycle arrest in vitro in both models. Although fulvestrant fails to inhibit tumor growth in either of the xenograft models, MI-77301 is highly effective in inhibition of tumor growth at a well-tolerated dose schedule. This study provides a preclinical rationale for evaluation of MI-77301 or other MDM2 inhibitors as a new therapeutic strategy for the treatment of endocrine-resistant breast cancer retaining wild-type p53. Mol Cancer Ther; 15(12); 2887-93. ©2016 AACR.


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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
TP53 wild-type breast cancer predicted - sensitive SAR405838 Preclinical - Pdx Actionable In a preclinical study, SAR405838 (MI-77301) induced p53 signaling and inhibited tumor growth in patient-derived xenograft models of endocrine therapy-resistant breast cancer with wild-type TP53, and induced cell-cycle arrest and inhibited growth of patient-derived endocrine therapy-resistant breast cancer cells in culture (PMID: 27765850). 27765850