CDK4/6 inhibition enhances SHP2 inhibitor efficacy and is dependent upon RB function in malignant peripheral nerve sheath tumors
- Johns Hopkins University, Baltimore, MD (United States). School of Medicine
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Washington University, St. Louis, MO (United States)
- University of Minnesota, Minneapolis, MN (United States)
- Novartis Institutes for Biomedical Research, Cambridge, MA (United States)
Malignant peripheral nerve sheath tumors (MPNSTs) are highly aggressive soft tissue sarcomas with limited treatment options, and new effective therapeutic strategies are desperately needed. We observe antiproliferative potency of genetic depletion of PTPN11 or pharmacological inhibition using the SHP2 inhibitor (SHP2i) TNO155. Our studies into the signaling response to SHP2i reveal that resistance to TNO155 is partially mediated by reduced RB function, and we therefore test the addition of a CDK4/6 inhibitor (CDK4/6i) to enhance RB activity and improve TNO155 efficacy. In combination, TNO155 attenuates the adaptive response to CDK4/6i, potentiates its antiproliferative effects, and converges on enhancement of RB activity, with greater suppression of cell cycle and inhibitor-of-apoptosis proteins, leading to deeper and more durable antitumor activity in in vitro and in vivo patient-derived models of MPNST, relative to either single agent. Overall, our study provides timely evidence to support the clinical advancement of this combination strategy in patients with MPNST and other tumors driven by loss of NF1.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- Children’s Cancer Foundation; Hyundai Hope on Wheels; NF Research Initiative; Neurofibromatosis Therapeutic Acceleration Program; Novartis Institute for Biomedical Research; SKCCC Cancer Center Core National Institutes of Health; USDOE
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 2221919
- Report Number(s):
- PNNL-SA--181806
- Journal Information:
- Science Advances, Journal Name: Science Advances Journal Issue: 47 Vol. 9; ISSN 2375-2548
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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