The Who, What, Where, When and Sometimes, Why.

Tumor Size and Staging

Tumor size is strongly related to prognosis (chances for survival). In general, the smaller the tumor, the better the prognosis tends to be [13].

Tumor size is part of breast cancer staging. 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 (T0).

A diagnosis of carcinoma in situ is classified 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 (Paget): Paget disease of the breast (Paget disease of the nipple) with no DCIS 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

Adapted from American Joint Commission on Cancer materials [42].

 

TOOLS & RESOURCES

Fact Sheet

Fact Sheet

Need Help or More Information?

1-877 GO KOMEN
(1-877-465-6636)