There was also no decorin mRNA detected in the area within breast tissue specimen containing malignant proliferation of ductal or lobular epithelial cells with myoepithelium, the so-called ductal carcinoma in situ (DCIS) (Fig. 3a–f), and lobular carcinoma in situ (LCIS) (data not shown). This evidence concerns the gene DCN and ductal breast carcinoma in situ.