- follow up information available
- axillary clearance was performed
- no earlier other cancer except basal cell ca or low grade cervical ca
- no earlier primary breastcancer
- no relapse before or at registration at the DDHCC
- no metastasis at surgery and no relapse within 1 month after surgery
- if surgery elsewhere referred to DDHCC within 3 months (90 days)
- date of surgery up till (incl) 1993
- tissue available at Rotterdam tunmorbank
Inclusion criteria for patients in this series: