Organ Systems, Breast Breast – Tubular Carcinoma October 24, 2017 peferguson General Low-grade (well differentiated, extensive tubule formation) Morphological overlap with a benign sclerosing lesion (e.g. radial scar) Use myoepithelial marker(s) (e.g. SMM-HC, calponin, p63) to differentiate from a benign process. Photomicrograph Breast – Tubular Carcinoma Breast – Tubular Carcinoma Breast – Tubular Carcinoma