CD44 in tumor cells of breast cancer, when compared with luminal A, B, HER2/neu+, and basal-like classification, it was observed that the basal-like variant showed more expression of CD44 when compared to almost Nil expression of CD44 in luminal A, as well as luminal B. Hence, CD44 expression suggests poor prognosis [10]. Here, ERBB2 is linked to breast cancer.