High-risk neuroblastoma has an overall survival of only 50%, and alternative treatment options for this patient group are needed. In this thesis, I will present novel insight into potential anti-tumor mechanisms for high-risk neuroblastoma. Firstly, our investigations have revealed a tumor suppressor function of the microRNA (miRNA) <i>miR-323a-3p</i> in neuroblastoma cells, and that this miRNA ...