DAB2 and ductal breast carcinoma in situ: Breast cancer tissue specimens (invasive ductal carcinoma [n = 72]; invasive lobular carcinoma [n = 1]; medullary carcinoma [n = 1]; ductal carcinoma in situ with microinvasion [n = 2]) were collected from 76 patients and subjected to immunohistochemistry for Dab2, together with normal breast tissues from 10 controlled subjects.