Table 4

Multivariate Cox regression analysis of overall survival

Characteristic

Relative risk

95% confidence interval

P value

ER-negative

1.65

1.09–2.50

0.02

Node-positive

1.70

0.79–3.66

0.17

Tumor size >2 cm

1.66

1.09–2.52

0.02

Adjuvant chemotherapy

1.02

0.48–2.17

0.96

ER status remains an independent prognostic factor of overall survival. ER, estrogen receptor.

van der Hage et al. Breast Cancer Research 2007 9:R70   doi:10.1186/bcr1778