A higher percentage of patients with NSCLC (47.47%; 122/257) showed high mRNA expression levels of ERCC1 compared with data from a previous study (20), while the percentage of patients with NSCLC with a high RRM1 mRNA expression level (61.87%; 159/257) was consistent with data presented in a previous study (21). Here, ERCC1 is linked to non-small cell lung carcinoma.