a positive trendP <0.0001
Linear regression model showed a positive trend toward increasing KI with molecular subtypes in both age groups ( P <0.0001), Figure 1 .
Linear regression model showed a positive trend toward increasing KI with molecular subtypes in both age groups ( P <0.0001), Figure 1 .
By multivariate analysis, the mean ER ( P =0.040) and PR ( P =0.031) levels, tumour grade ( P <0.0001) and DNA ploidy ( P =0.0021) were independently associated with age, after controlling for race, T and N stages, tumour size and grade, whereas the KI was not significant ( P =0.469) and p53 was mildly significant ( P =0.064).