In the ethnicity subgroup analyses, the results showed that KLF4 expression had no impact on OS (HR = 0.77, 95% CI: 0.56–1.05, P = 0.1) in Asian cancer patients (Fig. 3B) or OS in non-Asian patients (HR = 1.44, 95% CI: 0.82–2.53, P = 0.2) (Fig. 3A). Here, KLF4 is linked to cancer.