While we previously described that gastric-epithelial-specific expression of KrasG12D is sufficient to trigger gastric adenoma formation,28 we only detected adenomas when concurrently mutating Pi3kca and Pten with the Tff1CreERT2 driver stain, not when either gene was mutated individually (Figures S1E–S1H). The gene discussed is PTEN; the disease is gastric adenoma.