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• W2945385228 abstract "Intraoperative semiquantitative classification of different visible 5-aminolevulinic acid (5-ALA) fluorescence levels by the neurosurgeon is subjective. Recently, handheld spectroscopic probes were introduced enabling quantitative analysis of 5-ALA induced fluorescence intensity (FI). The aim of this ex-vivo study was to correlate the FI in gliomas of different grades with histopathology, proliferation and microvasular density (MVD).Patients with suspected World Health Organization (WHO) grade II-IV gliomas were included and tissue samples from different visible fluorescence levels (strong, vague or none) were intraoperatively collected. After resection, the FI of each sample was investigated ex-vivo by a handheld spectroscopic probe. The FI values were correlated with visible fluorescence, histopathology (WHO grade, quality of tissue, histopathological parameters of anaplasia), proliferation (MIB-1) and MVD.Altogether, 143 tumor samples with strong (n = 61), vague (n = 21) and no fluorescence (n = 61) were collected in 68 patients. We found significantly different median FI values between all three visible fluorescence levels. Moreover, the median FI value was significantly higher in WHO grade III/IV samples and compact tumor tissue compared to WHO grade II samples and infiltrated tumor tissue. Further, significant differences in median FI values were observed in specific histopathological parameters of anaplasia (mitotic rate, cell density, nuclear pleomorphism and microvascular proliferation) in multivariable analysis. Finally, a significant correlation between the proliferation rate and FI, but not between MVD and FI was noted.Our data indicate that handheld spectroscopic probes are capable of visualizing intratumoral glioma heterogeneity by objective assessment of fluorescence and may thus optimize future glioma surgery." @default.
• W2945385228 created "2019-05-29" @default.
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• W2945385228 date "2019-09-01" @default.
• W2945385228 modified "2023-09-23" @default.
• W2945385228 title "Ex-vivo analysis of quantitative 5-ALA fluorescence intensity in diffusely infiltrating gliomas using a handheld spectroscopic probe: Correlation with histopathology, proliferation and microvascular density" @default.
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• W2945385228 doi "https://doi.org/10.1016/j.pdpdt.2019.05.013" @default.
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