The German Cancer Society (Deutsche Krebsgesellschaft, DKG) is the largest scientific organisation in German oncology with headquarters in Berlin. We are committed to cancer care on the basis of evidence-based medicine, interdisciplinarity and consequent quality standards and use our influence to the benefit of cancer patients in the committee work: with politicians, professional associations, health care providers and patient organizations. Our special expertise is in the development of clinical practice guidelines and coordination of guidelines in the framework of the German Guideline Programme of Oncology (GGPO). We also promote excellence in cancer care by certifying oncology care institutions. Moreover, we foster the improvement of cancer information given to patients. The German Cancer Society includes more than 7,200 individual scientific members organised in 23 working groups, 16 regional cancer societies and 35 sponsors from research-based pharmaceutical industries, scientific publishers and health insurances. Since 1962, DKG has been full UICC member.