Derimod kunne der i tumorer af lav grad (WHO- grad I og II, fx medulloblastoma, oligodendroglioma) ikke observeres nogen fluorescens efter indgift af det aktive stof.
In contrast, in low-grade tumours (WHO-grade I and II, e. g. medulloblastoma, oligodendroglioma) no fluorescence could be observed after application of the active substance.