ERO1A and non-small cell lung carcinoma: As mounting evidence had demonstrated that promoter methylation status was strongly relevant with gene expression, we next aimed to analyze the promoter methylation of ERO1L in NSCLC samples using the UALCAN algorithm, and the results certified that the promoter methylation was markedly decreased along with NSCLC progression from stages I–IV, which was consistent with the observation of that ERO1L levels that were elevated across NSCLC stages I–IV (Figure 5f).