Abstract
Background
Glioma is the most common primary brain tumor. Clear classification is crucial for accurate diagnosis and individualized treatment. Histopathological characteristics and genetic alterations have shown to be related to prognosis and treatment response. Germline variants are important components of genetic alterations. However, the distribution of germline variations in glioma patients and their association with survival remain unknown.
Methods
We carried out whole-exome sequencing on 99 cases to explore germline variants in glioma. We also analyzed the association of germline variants with clinicopathological features and other prognostic indicators.
Results
All the glioma cases harbored rare germline variants. Germline ALK variants (gALK-Mut) were identified in 12/99 (12.12%) patients. The gALK-Mut patients had significantly shorter overall survival than germline ALK wildtype (gALK-WT) patients in the all glioma group (99 cases) and the subset of patients with IDH-wildtype glioblastoma (IDH-WT-GBM, 39 cases) (P = 0.013 and 0.027, respectively). The gALK-Mut patients also had higher frequency of BIRC5, PIK3CA and RPN1 somatic mutations than the gALK-WT patients in IDH-WT-GBM. Other confounding factors appeared to contribute to patient survival. The subgroup of patients in IDH-WT-GBM with gALK-Mut/TP53-Mut had worse prognosis than the gALK-WT/TP53-Mut subgroup (P = 0.031); The gALK-Mut/TERT-WT and gALK-Mut/TERT-Mut subgroups both had a worse prognosis than the gALK-WT/TERT-Mut subgroup (P = 0.031 and 0.018, respectively).
Conclusions
Our study revealed ALK variation was an independent indicator of poor prognosis in glioma and IDH-WT-GBM. It could be a promising biomarker and tractable therapeutic target for this deadly disease.
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Data Availability
Data are available by contacting the corresponding author.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by LB, NUF H and CL. The first draft of the manuscript was written by LB and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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11060_2020_3676_MOESM3_ESM.xlsx
Supplementary file4 Supplementary Table 3. The damage scores of ALK variants were evaluated using PolyPhen-v2 database (XLSX 10 KB)
11060_2020_3676_MOESM4_ESM.pdf
Supplementary file3 Supplementary Figure 1. The expression of ALK between gALK-Mut and gALK-WT patient’s samples. Protein level were measured in 43 patients with glioma, 5 patients with ALK variants and 38 gALK-WT patients as normal control. The scores were calculated based on the percentage of ALK positive cells, 0%-20% positive cells were presented score 0 (A-C); 21%–50% positive cells were presented score 1 (D-F); 51%-80% positive cells were presented score 2 (G-I), as well as 81%-100% positive cells were presented score 3 (J-L). Statistical analysis showed that no significant differences were observed between two groups respectively (M-N) (PDF 162 KB)
11060_2020_3676_MOESM5_ESM.tif
Supplementary file5 Supplementary Figure 2. Summary of two major germline mutated genes identified in 39 IDH-WT-GBM cases. (A) PIK3CA. (B) BIRC5. Each circle with a stem represents a unique somatic variant. The upper labels represent gALK-Mut patients and the lower labels represent gALK-WT patients (TIF 17736 KB)
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Bu, L., Hameed, N.U.F., Luo, C. et al. Germline ALK variations are associated with a poor prognosis in glioma and IDH-wildtype glioblastoma. J Neurooncol 152, 27–36 (2021). https://doi.org/10.1007/s11060-020-03676-5
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DOI: https://doi.org/10.1007/s11060-020-03676-5