In addition, we also use the database (http://kmplot.com/analysis/) to analyze the relationship between ALDH1A1 and Sox2 mRNA levels and survival of gastric cancer patients; we found that high ALDH1A1 mRNA levels were associated with better survival, while, high Sox2 mRNA levels were associated with poor prognosis (S2 Fig). The gene discussed is SOX2; the disease is gastric cancer.