BAP1 and cancer: Nuclear BAP1 expression was associated withTMPRSS2:ERG rearrangement and ERG expression: Strong BAP1 positivity increased from 12-14% in 5,415 ERG-negative cancers (by IHC or FISH) to 30-32% in 4,217 ERG-positive cancers (p<0.0001 each, Figure 2).