Background and purpose: High expression of excision repair cross-complementing 1 (ERCC1) is related to resistance in patients treated with platinum-containing regimens. The ERCC1 antibody 8F1 was usually used in past studies

but it was found to have no-specificity recently. This study aimed to investigate the predictive role of a new ERCC1 antibody 4F9 to platinum chemotherapy in non-small cell lung cancer (NSCLC) patients. Methods: Expression of ERCC1 was detected using antibody 4F9 by immunohistochemistry (IHC) in 72 NSCLC tissues. The relationship between the expression of ERCCl and the clinical pathological parameters

the efficacy of platinum chemotherapy and overall survival of patients were explored by statistical analysis. Results: The high expression of ERCCl protein was 55.5％in 72 cases. There was no significant correlation between the ERCC1 expression with gender

age

pathological type

clinical stage and lymphatic metastasis (P0.05). Patients with low expression of ERCC1 had significantly higher response rates to platinum chemotherapy

longer median survival time and 2-years survival rate comparing with those with high expression of ERCC1 (62.5％ vs 37.5％; 22.9 vs 18.4 month; 46.9％ vs 37.5％)

respectively (P0.05). Conclusion: The expression analysis of ERCC1 using new ERCC1 antibody 4F9 by IHC method is helpful to assign chemotherapeutic regimen

and guide individual platinum chemotherapy for post-operation patients.