Table 1.

Main variables reported to the DBCG database

Main groups	Variables
Patient characteristics	Age, menopausal status, comorbidity
Reasons not to enter standard treatment program for primary breast cancer	Distant metastases, previous malignant disease (except cancer cutis/cancer colli uteri in situ), bilateral breast cancer, technically inoperable or not operated according to guidelines, patient preference
Tumor characteristics	Histological diagnosis, tumor size, number of examined nodes, number of positive nodes, grade, ER status, HER-2 status
Surgery	Type of preoperative biopsy, sentinel node biopsy, axillary dissection, lumpectomy +/− oncoplastic surgery, mastectomy +/− reconstruction
Adjuvant therapy	Radiotherapy, chemotherapy, endocrine therapy, anti-HER-2 therapy
Follow-up	Vital status, recurrence, contralateral breast cancer, other malignant disease

Abbreviations: DBCG, Danish Breast Cancer Cooperative Group; ER, estrogen receptor; HER-2, human epidermal growth factor receptor 2.