Low expression of Beclin 1 also served as a poor prognostic factor in each stage of NSCLC patients in the testing set: stage I (p = 0.002 for OS and p = 0.030 for PFS, Figure 4A and 4B), stage II (p = 0.018 for OS and p = 0.049 for PFS, Figure 4C and 4D), and stage III (p < 0.001 for OS and p = 0.003 for PFS, Figure 4E and 4F). Here, BECN1 is linked to non-small cell lung carcinoma.