In Cluster 2 we find transcripts that are overexpressed in neurboastoma cells lines as well as spleen or lung: CD9 (tetraspanin, neuroblastoma marker), Plod3 (collagen biosynthesis), Fusip1 (neuronal differentiation), Brd2 (transcription), Tuba2 (tubulin alpha), DEK, Prpf38b, Hmgb1 (inflammatory mediator), and Serbp1 (serpine). This evidence concerns the gene CD9 and neuroblastoma.