KCNQ1 and gastric adenocarcinoma: Comparing the transcriptomes of isolated Prom1+ gastric stem cells and their Prom1− daughter cells from normal gastric mucosa and gastric adenocarcinomas, we observe that KCNQ1 is down-regulated and KCNQ2/3/5 genes are significantly up-regulated (Q < 0.05) in gastric adenocarcinomas in this model (Fig S4F).