Abstract
Introduction
Glioblastoma (GBM) is the most aggressive central nervous system (CNS) tumor with astrocytic differentiation. The growth pattern of GBM mimics that of the precursor cell migration during the fetal development of the brain. Diaphanous homolog (Diaph3) has been established to play a role in both CNS maturation and cancer progression as it is required both for cell migration and division. Furthermore, Diaph3 has been shown to play a role in malignant disease progression through hyperactivation of the EGFR/MEK/ERK in loss of expression and its overexpression correlating to hyperactivity of the mTOR pathway, both of which are with a well-established role in GBM. Herein, we aimed at establishing the diagnostic role of Diaph3 immunohistochemistry expression patterns in GBM and their possible implications for molecular response to different therapies.
Materials and methods
The study utilized a retrospective nonclinical approach. Results of Diaph3 immunohistochemical expression were compared to healthy controls and reactive gliosis and statistically analyzed for correlation with neuroradiological tumor parameters and patient survival.
Results
Healthy controls showed individual weakly positive cells, while reactive gliosis controls showed a strong expression in astrocytic projections. GBM samples showed a heterogeneous positive reaction to Diaph3, mean number of positive cells 62.66%, median 61.5, range 12–96%. Areas of migrating cells showed a strong diffuse cytoplasmic reaction. Cells located in the tumor core and those in areas of submeningeal aggregation had no antibody expression. Statistical analysis revealed no correlation with tumor size or patient survival.
Conclusion
The different expression pattern of Diaph3 in healthy controls, reactive gliosis and GBM shows promise as a clinical differentiating marker. Despite Diaph3 expression not correlating with survival and tumor size in GBM, there is an accumulating body of evidence that Diaph3 correlates with mTOR activity and can thus be used as a predictor for response to rapamycin and taxanes, clinical studies of which have shown promising, if mixed results in GBM.
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Funding
The study was funded by the Medical University – Varna Scientific fund, grant number 19010 and the National scientific fund—young researchers, grant number 2990/07.06.2021.
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GSS conceptualized the study, analyzed preliminary findings, performed the statistical analysis and wrote the initial draft with figure design; EL collected patient data, revised findings and statistical results; RG analyzed preliminary findings and assisted with statistical analysis and figure design; DD and LP assisted in patient selection and data analysis; AK and BDI assisted in statistical analysis and finding interpretation; PG revised the findings, manuscript and figures as well as approved the final version of the manuscript; all althours have read and approve the final version of the manuscript
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The authors declare no competing interests.
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All procedures included in the study adhered to the ethical standards of the Declaration of Helsinki 1964 and its seventh revision from 2013. The study was approved by the Committee on Ethics for Scientific Research, Medical University—Varna "Prof. Dr. Paraskev Stoyanov," —Protocol no. 93/21.05.2020.
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Stoyanov, G.S., Lyutfi, E., Georgieva, R. et al. Diaph3 underlines tumor cell heterogeneity in glioblastoma with implications for treatment modalities resistance. J Neurooncol 157, 523–531 (2022). https://doi.org/10.1007/s11060-022-03996-8
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DOI: https://doi.org/10.1007/s11060-022-03996-8