Fig. 1

NNMT protein expression in the breast tissue microarray and Kaplan-Meier survival curves. a–d NNMT staining observed in sections by IHC at high (× 400) magnification. a Breast hyperplasia with low expression of NNMT (n = 20). b Paracancerous tissues with low NNMT expression (n = 60). c, d Breast cancer with high NNMT expression (n = 165). e Overall survival curves of 82 breast cancer patients with a chemotherapy efficacy record stratified into two groups with high NNMT expression or low NNMT expression, generated by Kaplan-Meier methodology and the log-rank test