Statistical analyses
Medians and interquartile ranges were used to summarise Ki67The relationship between each of Ki67Univariable models were fitted containing only the variable of interest. P values given are for a likelihood ratio test comparing this model with a null model containing no variables. Multivariable models were fitted containing all known prognostic variables listed in the same model. P values given are from a likelihood ratio test comparing this model with a model containing all variables except the one of interest. The multivariable models for Ki67Analyses were based on the snapshot of the clinical data taken on 6th February 2018, consistent with the main clinical results paper. All analyses were performed using STATA 15.