We collected another cohort of tumors and normal lung tissues from NSCLC patients (Cohort 2) and confirmed that CCL7 is highly expressed in tumor tissues compared to the normal lung tissues (Fig. 1b and Supplementary Tables 2 and 3), which is consistent with the data from the Gene Expression Profiling Interactive Analysis (GEPIA) (http://gepia.cancer-pku.cn/detail.php?gene=CCL7). Here, CCL7 is linked to non-small cell lung carcinoma.