ATF4 and non-small cell lung carcinoma: Therefore, the correlation between ATF4 and SLC1A5 in NSCLC patients were investigated through the GEPIA website (http://gepia.cancer-pku.cn) [21], and the results indicated that the mRNA expression level of ATF4 and SLC1A5 was positively correlated (p value < 0.0001, R = 0.45), as was the expression of ATF4 and ASNS (p value < 0.0001, R = 0.31) (Fig. 5C).