With advancement of studies in CSCs, the correlation between marker expression, tumour initiation, invasion, and metastatic properties has been questioned. Furthermore,
coexpression of surface markers in CSCs is sometimes debatable in several cancer types. Every marker shows independent expression level but seems to have coordination
with each other in developing tumours at different stages. A recent study demonstrated no correlation between marker expression and tumourigenic potentiality in CSCs of the
same cancer type obtained from different patients.Abraham et al.demonstrated ≤10% prevalence of CD44+/CD24− in 78% and >10% of these cells in 22% of breast cancer samples and extended to suggest that there is no correlation between the prevalence of CD44+/CD24− cells and clinical outcome but indicated the chance of metastasis.
In contrast, Sheridan et al.demonstrated that there is no correlation between the prevalence of CD44+/CD24− cells with distant metastasis. This phenotype is associated with invasive properties but lacks the ability to proliferate. Supporting these two findings, Fillmore and Kuperwasser also showed that there is no correlation between the percentage of CD44+/CD24− cells and tumourigenicity. Later on Choi et al. demonstrated that CD133, CD24, and CD44 expression is related to invasiveness and differentiation but
did not show a close relationship with the survival outcome of colorectal adenocarcinoma.Stuelten et al.also showed no correlation between the marker expression and their clonogenic potentiality in cell lines. But very recently, and for the first time, a study in colorectal cancer revealed coexistence of CD133+ CD44+ stem-like cells with CD133+CD44high subset that exhibited more invasive in vitro and metastasis to liver in vivo [60]. However, direct investigations on metastatic ability of CSCs in vivo are very few and more validations are required. Significantly, it was found
that CSCs express invasive genes in vivo but are incapable of metastasis
With advancement of studies in CSCs, the correlation between marker expression, tumour initiation, invasion, and metastatic properties has been questioned. Furthermore,coexpression of surface markers in CSCs is sometimes debatable in several cancer types. Every marker shows independent expression level but seems to have coordinationwith each other in developing tumours at different stages. A recent study demonstrated no correlation between marker expression and tumourigenic potentiality in CSCs of thesame cancer type obtained from different patients.Abraham et al.demonstrated ≤10% prevalence of CD44+/CD24− in 78% and >10% of these cells in 22% of breast cancer samples and extended to suggest that there is no correlation between the prevalence of CD44+/CD24− cells and clinical outcome but indicated the chance of metastasis.In contrast, Sheridan et al.demonstrated that there is no correlation between the prevalence of CD44+/CD24− cells with distant metastasis. This phenotype is associated with invasive properties but lacks the ability to proliferate. Supporting these two findings, Fillmore and Kuperwasser also showed that there is no correlation between the percentage of CD44+/CD24− cells and tumourigenicity. Later on Choi et al. demonstrated that CD133, CD24, and CD44 expression is related to invasiveness and differentiation butdid not show a close relationship with the survival outcome of colorectal adenocarcinoma.Stuelten et al.also showed no correlation between the marker expression and their clonogenic potentiality in cell lines. But very recently, and for the first time, a study in colorectal cancer revealed coexistence of CD133+ CD44+ stem-like cells with CD133+CD44high subset that exhibited more invasive in vitro and metastasis to liver in vivo [60]. However, direct investigations on metastatic ability of CSCs in vivo are very few and more validations are required. Significantly, it was foundthat CSCs express invasive genes in vivo but are incapable of metastasis
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