ERCC1 and cancer: At least weak ERCC1 staining was found in 85.4% of cancers with immunohistochemically detected ERG expression and in 81.4% of tumors with ERG-rearrangement, but only in 52.6% (IHC) or 61.8% (FISH) of ERG-negative cancers (p < 0.0001 each, Fig. 2).