?:definition
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Stage 0 includes: Tis, N0, M0. Tis: High-grade squamous intraepithelial lesion (previously termed carcinoma in situ, Bowen disease, anal intraepithelial neoplasia II-III, high-grade anal intraepithelial neoplasia). N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 8th ed.)
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