KLF4 and cancer: In the ethnicity subgroup analyses, considerable heterogeneity was observed in both groups for OS and DFS/RFS/MFS; the results showed that KLF4 expression loss reduced significantly the OS (HR = 1.54, 95% CI: 1.28–1.84, P = 0.001) and DFS/RFS/MFS (HR = 1.91, 95% CI: 1.23–1.96, P = 0.001) in Asian cancer patients as well as the OS in Caucasian patients (HR = 1.17, 95% CI: 1.00–1.38, P = 0.07), but not the DFS/RFS/MFS in Caucasian ones (HR = 0.59, 95% CI: 0.36–0.94, P = 0.004).