?:definition
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Stage 0 includes: Tis, N0, M0. Tis: Ductal carcinoma in situ. Lobular carcinoma in situ is a benign entity and is removed from TNM staging in the AJCC Cancer Staging Manual, 8th Edition. N0: No regional lymph node metastasis is identified or isolated tumor cell clusters (ITCs) are identified only. M0: No clinical or radiographic evidence of distant metastases. Imaging studies are not required to assign the M0 category. (AJCC 8th ed.)
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