A previous study reported that higher Id1 levels were associated with an overall survival in adenocarcinoma but not in squamous cell carcinoma from 346 NSCLC patients[15], however survival analysis using the Kaplan-Meier plotter database (www.kmplot.com, 2014 version) with a log-rank test revealed that increased Id1 expression correlated with poor prognosis in both the adenocarcinoma and squamous cell carcinoma from 1405 NSCLC patients (Fig. 6D and Supplementary Fig. S7C). The gene discussed is ID1; the disease is non-small cell lung carcinoma.