Excision Repair Cross Complementing 1 (ERCC1) is a structure-specific endonuclease that is responsible for the 5'-incision during DNA repair. It forms a complex with ERCC11,XPF and ERCC4,which are required in both recombinatorial repair and nucleotide excision repair. It has been found that ERCC1,together with RRM1,are determinants of survival after surgical treatment of early-stage,non-small-cell lung cancer. (Ref: Simon,ER. 2005)