Table 5.

Contribution of various potential prognostic factors to overall survival by Cox regression analysis in node‐negative early breast cancer patients receiving epirubicin‐based adjuvant chemotherapy

Variable	Hazard ratio	95% confidence interval	P‐value
Estrogen receptor status †	1.005	0.461–2.192	0.98
Grading ‡	1.597	0.737–3.460	0.23
Cyclin E §	2.085	0.958–4.539	0.046

^† The risk ratio is given as negative versus positive tumors.

^‡ The risk ratio is given as G3 versus G2 tumors.

^§ The risk ratio is given as high versus low expressor tumors.