Abstract 7515: Uncovering transdifferentiation mechanisms underlying heterogeneity in neuroblastoma

Abstract Neuroblastoma is the most prevalent extracranial tumor in newborns and originates from neural crest-derived cells. Using selected Neuroblastoma cell lines, we generated clones engineered to express the non-coding RNA NDM29. This approach allowed us to investigate the function of NDM29 in tumor cell differentiation and to identify potential new therapeutic targets aimed at limiting tumor aggressiveness. Additional analyses, including single-cell sequencing, revealed the existence of distinct cellular subpopulations within this model. These subsets were subsequently separated through FACS sorting. The cellular heterogeneity observed in this system mirrors the complexity found in neuroblastoma patient samples. The clonal nature of our model and the presence of multiple subpopulations suggest that the observed heterogeneity arises from transdifferentiation processes. The plasticity of these subpopulations is a central focus of our study. The ability of cancer cells to undergo transdifferentiation is a key aspect in cancer research. In our model, we identified a subpopulation capable of responding to VEGF signaling and potentially able to regulate the angiogenic process within the tumor nodule. Understanding the plasticity mechanisms involved in this model, which lead to the generation of this and other subpopulations, may enable us to develop targeted therapeutic strategies aimed at counteracting tumor cell transdifferentiation. Citation Format: Michele Tomanelli, Jennifer Hoti, Ilaria Medici, Chaimae Sellak, Tullio Florio, Aldo Pagano. Uncovering transdifferentiation mechanisms underlying heterogeneity in neuroblastoma abstract. In: Proceedings of the American Association for Cancer Research Annual Meeting 2026; Part 1 (Regular Abstracts); 2026 Apr 17-22; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2026;86(7 Suppl):Abstract nr 7515.