"The AIC value for this model was 3333.06 while for a model using 10% or higher as the cutoff for ER positivity it was 3333.38 indicating that the model fits were nearly identical. The improvement in fit of the model when ERBB2 status was added was highly significant with 5-year disease-specific survival estimates ranging from 48% to 99% (P < .001)."xsd:string