Abstract
Purpose
For glioblastoma (GBM), imaging response (IR) or pseudoprogression (PSP) is frequently observed after chemoradiation and may connote a favorable prognosis. With tumors categorized by the Cancer Genome Atlas Project (mesenchymal, classical, neural, and proneural) and by methylguanine-methyltransferase (MGMT) methylation status, we attempted to determine if certain genomic or molecular subtypes of GBM were specifically associated with IR or PSP.
Methods
Patients with GBM treated at two institutions were reviewed. Kaplan-Meier method was used to estimate overall survival (OS) and progression-free survival (PFS). Mantel-cox test determined effect of IR and PSP on OS and PFS. Fisher’s exact test was utilized to correlate IR and PSP with genomic subtypes and MGMT status.
Results
Eighty-two patients with GBM were reviewed. The median OS and PFS were 17.9 months and 8.9 months. IR was observed in 28 (40%) and was associated with improved OS (median 29.4 vs 14.5 months p < 0.01) and PFS (median 17.7 vs 5.5 months, p < 0.01). PSP was observed in 14 (19.2%) and trended towards improved PFS (15.0 vs 7.7 months p = 0.08). Tumors with a proneural component had a higher rate of IR compared to those without a proneural component (IR 60% vs 28%; p = 0.03). MGMT methylation was associated with IR (58% vs 24%, p = 0.032), but not PSP (34%, p = 0.10).
Conclusion
IR is associated with improved OS and PFS. The proneural subtype and MGMT methylated tumors had higher rates of IR.
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This study was funded in part by the Ben and Catherine Ivy Foundation (RP, GF: patient data collected from the Swedish Neuroscience Institute). The content is solely the responsibility of the respective authors and does not necessarily represent the official views of the Ben and Catherine Ivy Foundation.
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All procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required.
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Soike, M.H., McTyre, E.R., Shah, N. et al. Glioblastoma radiomics: can genomic and molecular characteristics correlate with imaging response patterns?. Neuroradiology 60, 1043–1051 (2018). https://doi.org/10.1007/s00234-018-2060-y
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DOI: https://doi.org/10.1007/s00234-018-2060-y