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Mischkulnig, Mario; Kiesel, Barbara; Borkovec, Martin; Wadiura, Lisa; Benner, Dimitri; Hosmann, Arthur; Hervey-Jumper, Shawn; Knosp, Engelbert; Roessler, Karl; Berger, Mitchel S. und Widhalm, Georg (2020): High Interobserver Agreement in the Subjective Classification of 5-Aminolevulinic Acid Fluorescence Levels in Newly Diagnosed Glioblastomas. In: Lasers in Surgery and Medicine, Bd. 52, Nr. 9: S. 814-821

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Abstract

Background and Objectives: Fluorescence-guided resection of glioblastomas (GBM) using 5-aminolevulinic acid (5-ALA) improves intraoperative tumor visualization and is thus widely used nowadays. During resection, different fluorescence levels can usually be distinguished within the same tumor. Recently, we demonstrated that strong, vague, and no fluorescence correspond to distinct histopathological characteristics in newly diagnosed GBM. However, the qualitative fluorescence classification by the neurosurgeon is subjective and currently no comprehensive data on interobserver variability is available. The aim of this study was thus to investigate the interobserver variability in the classification of 5-ALA fluorescence levels in newly diagnosed GBM. Study Design/Materials and Methods: A questionnaire investigating the interobserver variability in 5-ALA fluorescence quantification was performed at a nation-wide neurosurgical oncology meeting. The participants involved in the neurosurgical/neurooncological field were asked to categorize 30 cases of 5-ALA fluorescence images derived from GBM resection on a lecture hall screen according to the widely used three-tier fluorescence classification scheme (negative, vague, or strong fluorescence). Additionally, participants were asked for information on their medical Background: such as specialty, level of training, and experience with 5-ALA fluorescence-guided procedures. Interobserver agreement was defined as the calculated mean kappa values for each observer. Results: A total of 36 questionnaires were included in the final analysis. The mean average kappa value in fluorescence classification within the entire cohort was 0.71 +/- 0.12 and 29 (81%) participants had a substantial or almost perfect interobserver agreement (kappa values 0.6-1.0). Interobserver agreement was significantly higher in neurosurgeons (mean kappa: 0.83) as compared with non-neurosurgeons involved in the neurooncological field (mean kappa: 0.52;P < 0.001). Furthermore, interobserver agreement was significantly higher in participants who had experience with at least 25 5-ALA fluorescence-guided surgeries (mean kappa: 0.87) compared with less experienced colleagues (mean kappa: 0.82;P = 0.039). Conclusion Our study found a high interobserver agreement in the qualitative classification of different 5-ALA fluorescence levels in newly diagnosed GBM. Interobserver agreement increases significantly in more experienced participants and therefore a high level of experience is crucial for reliable intraoperative fluorescence classification. Lasers Surg. Med. (c) 2020 The Authors.Lasers in Surgery and Medicinepublished by Wiley Periodicals, Inc.

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