Identifying Molecular Probes for Fluorescence-Guided Surgery in Neuroblastoma: A Systematic Review.
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Background/Objectives: Targeted and non-targeted fluorescent molecular probes (FMPs) can be used intra-operatively to visualise tumour tissue. Multiple probes have been clinically approved for fluorescence-guided surgery (FGS) in adult oncology, and the translation of these technologies to paediatric neuroblastoma may provide novel strategies for optimising tumour resection whilst minimising morbidity. We aimed to identify clinically approved FMPs with potential utility for FGS in neuroblastoma. Methods: A systematic review of the literature was performed in accordance with the PRISMA guidelines (PROSPERO CRD42024541623). PubMed and Web of Science databases were searched to identify studies investigating clinically approved FGS probes and/or their targets in the context of neuroblastoma. Pre-clinical and clinical studies looking at human neuroblastoma were included. The primary outcomes were that the FGS probe was tested in patients with neuroblastoma, the probe selectively accumulated in neuroblastoma tissue, or that the target of the probe was selectively over-expressed in neuroblastoma tissue. Results: Forty-two studies were included. Four were clinical studies, and the remainder were pre-clinical studies using human neuroblastoma cell lines, human tumour tissue, or xenograft models using human neuroblastoma cells. The only FMP clinically evaluated in neuroblastoma is indocyanine green (ICG). FMP targets that have been investigated in neuroblastoma include poly-ADP ribose polymerase (PARP) (targeted by PARPiFL), endothelial growth factor receptor (EGFR) (targeted by Panitumumab-IRDye800CW, Cetuximab-IRDye800CW, Nimotuzumab-IRDye800CW and QRHKPRE-Cy5), vascular endothelial growth factor receptor (VEGFR) (targeted by Bevacizumab IRDye800CW), and proteases such as cathepsins and matrix metalloproteinases that activate the fluorescent signal of FMPs, such as LUM015 and AVB-620. Of the clinical studies included, all were found to have a high risk of bias. Conclusions: ICG is the only clinically approved fluorescent dye currently used for FGS in neuroblastoma; however, studies suggest that its ability to recognise neuroblastoma tissue is inconsistent. There are several clinically approved FMPs, or FMPs in clinical trials, that are used in adult oncology surgery that have targets expressed in neuroblastoma. Further research should validate these probes in neuroblastoma to enable their rapid translation into clinical practice.