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Table 1 Feline mammary IELs (classified by human risk [3, 4]) and their association with invasive cancer

From: Spontaneous feline mammary intraepithelial lesions as a model for human estrogen receptor- and progesterone receptor-negative breast lesions

Risk

Number of IELs

% of total IELs

No. IELs associated with malignant tumors

% IELs associated with malignant tumors

Slight

Ductal hyperplasia

n = 17

27%

8/17

47%

Intermediate

Atypical ductal hyperplasia

n = 18

29%

17/18

95%

High

Ductal carcinoma in situ

n = 28

44%

25/28

89%

 

   ✓ low grade

6

 

6/6

100%

 

   ✓ intermediate

11

 

9/11

82%

 

   ✓ high

11

 

10/11

91%