Wei D, Gong W, Kanai M, Schlunk C, Wang L, Yao JC, Wu TT, Huang S, Xie K. Drastic down-regulation of Krüppel-like factor 4 expression is critical in human gastric cancer development and progression. Cancer Res. 2005 Apr 01;65(7):2746–54. doi: 10.1158/0008-5472.can-04-3619. PMID: 15805274.