Table 5. Cox multivariate analysis for 5-year disease-free survival.

	Overall population (n=90)
	Relative risk (s.e.)	P
Oestrogen receptor status	0.066 (0.876)	0.002
GST P1 level expression (⩽ vs >63%)	0.302 (0.469)	0.011

Model for overall population included the following factors (factors with a P-value <0.2 using univariate analysis): SBR grade, T stage, clinical and histologic node involvement, number of lymph nodes involved (< or ⩾3 N+), capsular invasion, presence of intravascular or intratumoral embolus, presence of intraductal or intralobular extensive carcinoma, oestrogen receptor status, MDR1 and GSTP1 gene expression.