NPC with antitumor properties show a high genetic semblance. Dendrogram of the genetical semblance between the gliomas N25, N32 and N29 as well as their relationship with the NPC HiB5, ST14A and RN33B. The arrangement is based on the initial array after pre-processing and filtering, before further steps for selecting genes were performed. The two NPC with antitumor effect cluster together and RN33B lacking antitumor effect clusters together with the gliomas. Hierarchical clustering and analysis was done with the software package BASE 1.2.17 (available at http://base.onk.lu.se). For the whole cluster analysis see Additional file 1.