Data Element

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AJCC T Category
For both Clinical (cT), Pathological (pT) and Neoadjuvant (ycT or ypT), the T Category is defined as the size and/or contiguous extension of the primary tumor. Note: The roles of the size component and the extent of contiguous spread are specifically defined for each cancer site. Primary Tumor (T) Categories: Primary tumor categories have specific notations to describe the existence, size, or extent of the tumor. TX: No information about the T category for the primary tumor, or it is unknown or cannot be assessed T0: No evidence of a primary tumor Tis: Carcinoma in situ T1, T2, T3, or T4: Primary invasive tumor, for which a higher category generally means • an increasing size • an increasing local extension, or • both


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