Abstract
Purpose
Gliomagenesis and resistance of glioblastoma (GBM) are believed to be mediated by glioma stem cells (GSC). Evidence suggests that SHH signaling promotes GSC proliferation and self-renewal.
Methods
ABTC-0904 was a two-arm, multicenter phase 0/II study of GDC-0449, an oral inhibitor of Smoothened (SMO) in patients undergoing resection for recurrent GBM. All patients (Arms I and II) had surgery and received drug post-operatively. Only patients in Arm I received drug prior to surgery. The primary objective was to determine 6-month progression free survival (PFS-6). Secondary endpoints include median PFS (mPFS) and overall survival (mOS), response rate, and toxicity. Correlative studies included bioanalysis of GDC-0449, and inhibition of SHH signaling, GSC proliferation and self-renewal.
Results
Forty-one patients were enrolled. Pharmacokinetics of GDC-0449 in plasma demonstrated levels within expected therapeutic range in 75% of patients. The proportion of tumorcells producing CD133+ neurospheres, neurosphere proliferation, self-renewal, and expression of the SHh downstream signaling was significantly decreased in Arm I following GDC-0449 treatment (p < 0.005; p < 0.001 respectively) compared to Arm II (no drug pre-op). Treatment was well tolerated. There were no objective responders in either arm. Overall PFS-6 was 2.4% (95% CI 0.9–11.1%). Median PFS was 2.3 months (95% CI 1.9–2.6) and mOS was 7.8 months (95% CI 5.4–10.1).
Conclusions
GDC-0449 was well tolerated, reached tumor, and inhibited CD133+ neurosphere formation, but had little clinical efficacy as a single agent in rGBM. This suggests growth and maintenance of rGBM is not solely dependent on the SHH pathway thus targeting SMO may require combined approaches.
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Data availability statement
All data refered to in this manuscript is available for review.
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Acknowledgements
The authors acknowledge the contributions of the patients who participated in this study and their families. We thank Lisa Rogers, DO, formerly from the Seidman Cancer Center, John Pink, Ph.D., and Erin Hohler of the Translational Research Core of the Case Comprehensive Cancer Center (CCCC) for coordinating the biomarker studies, as well as Megan Sims, of ABTC for clinical coordination.
Funding
National Institutes of Health [CA 137443-ARRA]; The Adult Brain Tumor Consortium (ABTC; PI, S.G.; Co-I, A.E.S); The Peter D. Cristal Chair; The Kimble Foundation; The Ferry Family Foundation; The Kaufman Fund (to A.E.S.).
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Study conception and design: SG, AES, MP, NT, WT. Clinical Protocol: AES, CJN, and SG. Development of Biomarker Studies: AES. Surgical Training of investigators: AES. Statistical design of study: Lamborn, XY. Conduct of clinical studies: CJN, AES, SG, MP. Performance of PK and PD studies: Graham, Supko. Performance of neurosphere assays, PCR, and microscopy: AES, AK-F. Analysis and interpretation of data: AES, CJN, Barnholtz-Sloan, AK-F, XY, Rich, SG, Prados. Drafting the article: AES, MP, Nock, Rich, SG. Critically revising the article: all authors. Patient care: AES, CJN, SG, MP.
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Sloan, A.E., Nock, C.J., Ye, X. et al. ABTC-0904: targeting glioma stem cells in GBM: a phase 0/II study of hedgehog pathway inhibitor GDC-0449. J Neurooncol 161, 33–43 (2023). https://doi.org/10.1007/s11060-022-04193-3
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DOI: https://doi.org/10.1007/s11060-022-04193-3