Tumor size is strongly related to prognosis. In general, the smaller the tumor, the higher the chances are for long-term survival .
In the TNM staging system, a "T" followed by a number shows the size of the tumor.
In some cases, the size of the tumor cannot be determined (TX) or a tumor cannot be found (TO).
A diagnosis of carcinoma in situ is written as Tis.
Tumor size categories
TX: Tumor size cannot be assessed
T0: No tumor can be found
Tis: Carcinoma in situ
Subcategories of Tis:
Tis (DCIS): Ductal carcinoma in situ
Tis (LCIS): Lobular carcinoma in situ
Tis (Paget): Paget disease of the breast (Paget disease of the nipple) with no DCIS, LCIS or invasive breast cancer
T1: Tumor is 2 cm or smaller
Subcategories of T1:
T1mi: Very small tumor (0.1 cm or smaller)
T1a: Tumor is larger than 0.1 cm, but no larger than 0.5 cm
T1b: Tumor is larger than 0.5 cm, but no larger than 1 cm
T1c: Tumor is larger than 1 cm, but no larger than 2 cm
T2: Tumor is larger than 2 cm, but no larger than 5 cm
T3: Tumor is larger than 5 cm
T4: Tumor is any size, but has spread beyond the breast tissue to the chest wall and/or skin
Subcategories of T4:
T4a: Tumor has spread to the chest wall
T4b: Tumor has spread to the skin, but is not inflammatory breast cancer
T4c: Tumor has spread to both the chest wall and skin
T4d: Inflammatory breast cancer
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