Journal
MOLECULAR CANCER THERAPEUTICS
Volume 20, Issue 6, Pages 1062-1071Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1535-7163.MCT-20-0807
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Funding
- University of Colorado Cancer Center NCI Support Grant [P30CA046934]
- NIH NRSA [T32 CA190216-01A1]
- DOD CTRA [W81SWH-13-1-0091/90]
- NIH [R01CA187733]
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TNBC is an aggressive subtype of breast cancer with limited treatment options. The combination therapy of CDK4/6 inhibitor and seviteronel shows synergy in high AR-expressing TNBC, suggesting a potential effective strategy for treatment.
Triple-negative breast cancer (TNBC) is an aggressive subtype, with a peak recurrence rate within the first few years after diagnosis. Few targeted therapies are available to treat this breast cancer subtype, defined by the lack of estrogen receptor (ER) and progesterone receptor and without amplification of human epidermal growth factor receptor 2 (HER2). Although cell cycle cyclin-dependent kinase (CDK) 4/6 inhibitors are approved for treatment of ER-positive (ER+) breast cancer, they have not proven effective as monotherapy in patients with TNBC. The androgen receptor (AR) has emerged as a therapeutic target in a subset of TNBCs and with significant clinical benefit observed in multiple trials. The purpose of this study was to investigate the preclinical activity of the CDK4/6 inhibitor, abemaciclib, in combination with an agent that targets both androgen biosynthesis and AR activity, seviteronel, using TNBC cell lines expressing high AR, cell line xenografts, and an AR-positive (AR(+)), androgen-responsive TNBC patient-derived xenograft (PDX). Single-cell RNA sequencing demonstrated heterogeneity in AR levels, even in a highly AR(+) cell line, and identified cell cycle pathway activation in ARHigh- versus ARLow-expressing cells. Combination treatment with the cell cycle CDK4/6 inhibitor, abemaciclib, and seviteronel showed synergy in an AR(+) TNBC model compared with each drug alone. Although cell cycle inhibitors are FDA approved for use in ER+ breast cancer, our studies suggest that they may also be effective in AR(+) TNBC, perhaps combined with AR-targeted agents.
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