Fig. 1

a ERCC1 immunohistochemistry in lung adenocarcinoma: positive and negative nuclear staining (HRP 200x). b Significant correlation was found between OS and level of ERCC1 expression (i.e. ERCC1 H scores, determined with multiplying the percentage of positive nuclear reaction by staining intensity). Longer OS was strongly associated with lower level of ERCC1 expression (lower H score) and a risk of death rose whenever ERCC1 expression rose (p < 0.001)