It is not uncommon that the prognostic value of molecular features are limited to ERG positive (Burdelski et al. 2015; Burdelski et al. 2016a; Melling et al. 2015) or ERG negative cancers (Heumann et al. 2017; Burdelski et al. 2016b; Heumann et al. 2018). The gene discussed is ERG; the disease is cancer.