Introduction: Since 30 years DBCG (Danish Breast Cancer Coperative Group) has maintained, on a nation-wide basis, a clinical database of diagnostic procedures, therapeutic interventions, and clinical outcome in patients with primary breast cancer. The present analysis was undertaken to evaluate the development of the prognosis since 1977, and to analyse factors potentially contributing to the change of the prognosis.
Material and methods: All cases of invasive breast cancer reported to DBCG during the period 1977-2006 were included in the present analysis.
Results: A total of close to 80 000 patients were registered in the DBCG Database. Since 1977 the prognosis has improved significantly, thus 5 year survival for the total population of patients with primary breast cancer has increased from 65 to 81%.
Discussion: According to the present analysis diagnosis at an earlier stage in the natural course of the disease and especially the development of more active systemic treatment modalities have contributed to the improved prognosis.