A data analysis of the tumour centres of the country Brandenburg was taken at the present treatise to judge the quality of oncologic supply. For breast cancer 7644 cases from 1995 to 2002 were investigated for following parameters: amount of postoperative irradiation after breast conserving surgery, R-classification, TNM-status, grading, hormone receptor status, local recurrence and survival time. The obligatoric irradiation after breast conserving surgery was realized in about 82 per cent in 1995-2000. The part of documented R0-stages was only 52,4 per cent at the same time. The documentation of pT-, pN-status and grading was happened in a good form, but not for the M- and hormone receptor status. The oncologic supply of patients with breast cancer is not equivalent in the country Brandenburg. Significant regional differences were found in reference to the rate of local recurrences and the survival time. In addition, significant differences refer to survival were found for lung cancer. The distribution of UICC-stages of small-cell and non-small-cell tumours did show regional differences as well. 1126 cases of small-cell and 4116 cases of non-small-cell lung cancer from 1997 to 2002 were investigated. The part of locally controlled operations in non-small-cell lung cancer was 25,4 per cent on average. The data documented in the clinic cancer registers of Brandenburg are qualified for using in the sense of quality assurance and should been used and optimised for an overall, comparative quality control in future.