Abstract
Cancer Genomics Many cancers are classified on the basis of the organ or tissue from which they originated. However, identifying the specific cells and conditions that precede tumorigenesis can help us understand and better treat the resulting disease. Nowicki-Osuch et al. used a single-cell approach to investigate the cell of origin for Barrett's esophagus (BE) and the mechanisms leading to the development of esophageal adenocarcinoma (EAC) (see the Perspective by Geboes and Hoorens). Analyses of healthy human esophageal tissues, mutational lineage tracing, and organoid models revealed that BE originates from the gastric cardia and that EAC arises from undifferentiated BE cells. This analysis provides a map of the transcriptional landscape of the healthy esophagus that can be compared with mouse models of disease. Science , abd1449, this issue p. [760][1]; see also abj9797, p. [737][2] [1]: /lookup/doi/10.1126/science.abd1449 [2]: /lookup/doi/10.1126/science.abj9797
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