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. 2021 Oct 21;126(5):706–717. doi: 10.1038/s41416-021-01485-9

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© The Author(s) 2021

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Fig. 1 — Low-grade and high-grade dysplasia are confined to the epithelium. T1a tumours are separated based on their depth of invasion (m1-3). T1b tumours invade into the submucosal layer and are further subdivided based on depth of invasion (sm1-3).