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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%