Welcome to the open access database CancerResource. It is a comprehensive knowledgebase for drug-target relationships related to cancer as well as for supporting information or experimental data. Furthermore, large-scale cancer genomics data is integrated into the CancerResource database including mRNA expression and non-synonymous mutations data. Therefore, CancerResource allows an explorative data analysis based on cancer related drug-target interactions, expression and mutation data as well as drug sensitivity data.