Intertumoral heterogeneity in patient-specific drug sensitivities in treatment-naïve glioblastoma
Erlend Skaga, Evgeny Kulesskiy, Artem Fayzullin, Cecilie J Sandberg, Swapnil Potdar, Aija Kyttälä, Iver A Langmoen, Aki Laakso, Emília Gaál-Paavola, Markus Perola, Krister Wennerberg, Einar O Vik-Mo, Erlend Skaga, Evgeny Kulesskiy, Artem Fayzullin, Cecilie J Sandberg, Swapnil Potdar, Aija Kyttälä, Iver A Langmoen, Aki Laakso, Emília Gaál-Paavola, Markus Perola, Krister Wennerberg, Einar O Vik-Mo
Abstract
Background: A major barrier to effective treatment of glioblastoma (GBM) is the large intertumoral heterogeneity at the genetic and cellular level. In early phase clinical trials, patient heterogeneity in response to therapy is commonly observed; however, how tumor heterogeneity is reflected in individual drug sensitivities in the treatment-naïve glioblastoma stem cells (GSC) is unclear.
Methods: We cultured 12 patient-derived primary GBMs as tumorspheres and validated tumor stem cell properties by functional assays. Using automated high-throughput screening (HTS), we evaluated sensitivity to 461 anticancer drugs in a collection covering most FDA-approved anticancer drugs and investigational compounds with a broad range of molecular targets. Statistical analyses were performed using one-way ANOVA and Spearman correlation.
Results: Although tumor stem cell properties were confirmed in GSC cultures, their in vitro and in vivo morphology and behavior displayed considerable tumor-to-tumor variability. Drug screening revealed significant differences in the sensitivity to anticancer drugs (p < 0.0001). The patient-specific vulnerabilities to anticancer drugs displayed a heterogeneous pattern. They represented a variety of mechanistic drug classes, including apoptotic modulators, conventional chemotherapies, and inhibitors of histone deacetylases, heat shock proteins, proteasomes and different kinases. However, the individual GSC cultures displayed high biological consistency in drug sensitivity patterns within a class of drugs. An independent laboratory confirmed individual drug responses.
Conclusions: This study demonstrates that patient-derived and treatment-naïve GSC cultures maintain patient-specific traits and display intertumoral heterogeneity in drug sensitivity to anticancer drugs. The heterogeneity in patient-specific drug responses highlights the difficulty in applying targeted treatment strategies at the population level to GBM patients. However, HTS can be applied to uncover patient-specific drug sensitivities for functional precision medicine.
Keywords: Drug sensitivity; Functional precision medicine; Glioblastoma; Glioblastoma stem cells; High-throughput drug screening; Individualized medicine.
Conflict of interest statement
The authors declare that they have no competing interests.
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References
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