Caption |
Mammary gland, adenocarcinoma. Neoplastic cells labeling for alpha smooth muscle actin form a continuous row at the periphery of neoplastic lobules in this area with a comedo pattern. In addition, a moderate number of neoplastic cells randomly distributed in neoplastic lobules moderately label for alpha smooth muscle actin. A moderate number of myofibroblasts scattered in the stroma of the tumor and smooth muscle fibers of the wall of blood vessels also label for alpha smooth muscle actin. |