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| National Cancer Institute | Very good site about the various tumour entities, both for doctors and patients. |
| Journal of Clinical Oncology | The magazine for the clinically active oncologist. |
| Working group for the coordination of clinical cancer registries | Information on tumour documentation and cancer registries. |
| Working Group of the Scientific Medical Societies | Association of all specialised medical societies. Listing of various guidelines. |
| German Cancer Society | Lots of oncological information for doctors and patients. |
| Working Group of German Tumour Centres | Umbrella organisation of German tumour centres. Tasks of the German tumour centres. |
| German Cancer Aid | Promotes projects to improve diagnosis, therapy, self-help and aftercare for oncological patients. |
| INFONETZ KREBS | Personal cancer counselling (advice for those affected on all questions of a medical, socio-legal, financial or psychological nature) |
| Internal Oncology Working Group | Implementation of oncological clinical studies. |
| Cancer Information Service (KID) | Quality-assured information about cancer. |
| German Working Group for Psychosocial Oncology e.V. | Association of all professional groups involved in the medical and psychosocial care of cancer patients and their relatives or in psycho-oncological research. As a nationwide association, the dapo aims to intensify the exchange between the individual professional groups, pool experience from different fields of activity and encourage and support their scientific work. |