Measuring Cancer burden in prostatic needle core biopsies: Simplified assessments outperform complex measurements in assessing outcome: evidence to assist pathologist efficiency and minimise datasets.

Cancer extent is a strong predictor of PCa death but only %+cores adds to the multivariate model. Expressed as a fraction of NPC/total number of cores, this is the simplest method of assessment which we favour over more complicated methods in non-targeted biopsies.