Multivariate Cox regression of tumor cell ERG IR of patients followed with watchful waiting.

*Reference value.
**Cox regression analysis using Gleason score, local tumor stage and tumor ERG-IR as categorical variables.
Abbreviations: RR, relative risk; CI, confidence interval; immunoreactivity, IR.
#The group includes both Gleason grade 6 and 7 since the number of patients with grade 7 are too few to allow a separate analysis of this group.