Table 1

Id-1 protein immunoreactivity levels in breast cancer biopsies

Breast cancer biopsies were obtained and stained for Id-1 protein expression by immunohistochemistry, as described in “Materials and Methods.”

NegativeWeakly positiveStrongly positive
DCIS80% (8/10)10% (1/10)10% (1/10)
Infiltrating33% (4/12)8% (1/12)58% (7/12)