Table 5. Multivariate analysis of DFS by Cox regression in subgroup of the patients with node-negative and high all-PRLR expression.

Parameters	HR	95% CI		P value
		Lower	Upper
Age ≥50 years	0.428	0.122	1.499	0.185
Tumor size >2 cm	2.676	0.680	10.535	0.159
LF-PRLR expression	5.224	1.089	25.064	0.039

DFS, disease-free survival; all-PRLR, all prolactin receptor isoforms; HR, hazard ratio; CI, confidence interval; LF-PRLR, long-form prolactin receptor.