CD44 and breast carcinoma: Similarly, Ricardo et al reported that most tumors have higher levels of CD44 expression and lower levels of CD24 expression.[15] A high CD44/CD24 ratio was reported to be related to tumor stemness, cell proliferation, and tumorigenesis.[24] A high ratio of CD44/CD24 was also found to be associated with shorter OS in breast carcinoma.[11] However, we could not find any significant relationship between CD44/CD24 ratio and any other parameter.