Brainstem gliomas are molecularly heterogeneous diseases, many of which are difficult to safely surgically resect and have limited treatment options due to their eloquent location. These constraints pose challenges to biopsy, which limits the use of routine molecular profiling and identification of personalized therapies. Here, we explored the potential of sequencing of circulating tumor DNA (ctDNA) isolated from the cerebrospinal fluid (CSF) of brainstem glioma patients as a less invasive approach for tumor molecular profiling. CSF was obtained from patients either intraoperatively (91.2%, 52/57), from ventricular-peritoneal shunt (3.5%, 2/57), or by lumbar puncture (5.3%, 3/57), all prior to surgical manipulation of the tumor. Deep sequencing of glioma-associated genes was performed on CSF-derived ctDNA and, where available, matched blood and tumor DNA from 57 patients, including nine medullary and 23 diffuse intrinsic pontine gliomas (DIPG). At least one tumor-specific mutation was detected in over 82.5% of CSF ctDNA samples (47/57). In cases with primary tumors harboring at least one mutation, alterations were identified in the CSF ctDNA of 97.3% of cases (36/37). In over 83% (31/37) of cases, all primary tumor alterations were detected in the CSF, and in 91.9% (34/37) of cases, at least half of the alterations were identified. Among ten patients found to have primary tumors negative for mutations, 30% (3/10) had detectable somatic alterations in the CSF. Finally, mutation detection using plasma ctDNA was less sensitive than sequencing the CSF ctDNA (38% vs. 100%, respectively). Our study indicates that deep sequencing of CSF ctDNA is a reliable technique for detecting tumor-specific alterations in brainstem tumors. This approach may offer an alternative approach to stereotactic biopsy for molecular profiling of brainstem tumors.
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Financial support was provided by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (Grant nos. 2014BAI04B01 and 2015BAI12B04), Beijing Municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support (Grant no. ZYLX201608), and Grant for CP from Beijing Municipal Bureau of Human Resources and Social Security (Grant no. 2017-ZZ-117).
Conflict of interest
HY is a founder of Genetron Health and receives royalties from Personal Genome Diagnostics (PGDX) and Agios. YJ is a co-founder of and Scientific Advisor for Genetron Health. BHD serves as a scientific consultant for Genetron Health.
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Supplementary material 7 Detection of brain tumor-associated alterations in tumor tissue DNA and CSF-derived ctDNA. Comparing the portions of patients with detectable somatic alterations in 47 patients with available matched CSF ctDNA and tumor tissue DNA reveals that the CSF shows similar patterns to tumor DNA across different a tumor types, b tumor locations and c tumor volumes. (TIFF 20275 kb)
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Pan, C., Diplas, B.H., Chen, X. et al. Molecular profiling of tumors of the brainstem by sequencing of CSF-derived circulating tumor DNA. Acta Neuropathol 137, 297–306 (2019). https://doi.org/10.1007/s00401-018-1936-6
- Liquid biopsy
- H3K27M mutation