TFF1 and neoplasm: 4 wk following tamoxifen-induced activation of Cre, tumor burden was compared between the resulting Gp130FF; Yap1KO mice with Yap1-deficient gastric epithelium and their vehicle-treated Yap1-proficient Gp130FF; Tff1:CreERT2; Yap1fl/fl littermates (referred to as Gp130FF; Yap1WT mice Fig 3B).