Table 6: Cox regression of potential prognostic factors in patients over 70 ( values).

VariableLocal recurrenceDistant recurrence

Histopathology0.0430.702
Tumor differentiation 0.8550.571
Tumor size (cm)0.5200.006
Involved nodes0.306<0.001
Estrogen receptor positive<0.0010.008
Postoperative chemotherapy0.5170.198
Tamoxifen0.0910.375
Radiation therapy 0.6200.375
Undertreatment0.1500.818

Invasive tumors.