The DKTK project 'Molecular Stratification Program' at the National Center for Tumour Diseases (NCT) in Heidelberg focuses on customized therapies. The term 'stratification' refers to the initiative to assign patients with the same initial diagnosis to subgroups according to molecular results in order to be able to offer them a tailored therapy. The project promotes the development of a central database containing gene defects and changes in gene activity of tumour cells. The tumour profiles will help hospitals to tailor therapy for individual patients.