Significance of CD44 and CD24 as cancer stem cell markers: an enduring ambiguity

Area of Science:

• Oncology
• Cancer Biology
• Immunology

Background:

• Cancer stem cells (CSCs) drive tumor progression, metastasis, and treatment resistance.
• Identifying and isolating CSCs remains a significant challenge in cancer research.
• Surface markers are explored for CSC identification, but universal markers are lacking.

Purpose of the Study:

• To critically review the role of CD44 and CD24 in tumor initiation, development, and metastasis.
• To analyze the significance of CD44 and CD24 as CSC surface markers, individually and in combination with other markers.
• To address the ambiguity surrounding the expression and prognostic value of CD44 and CD24 in CSC isolation.

Main Methods:

• Critical review of existing literature on CSCs and surface markers.
• Analysis of studies focusing on CD44 and CD24 expression in various cancer types.
• Evaluation of the combined use of CD44, CD24, and other putative markers for CSC identification.

Main Results:

• CD44 and CD24 are commonly studied CSC surface markers with variable expression across tumor types.
• Their combined expression and prognostic value for CSC isolation are not definitively established.
• Lack of universal marker combinations hinders reliable CSC identification and isolation.

Conclusions:

• Targeting CSCs offers a promising avenue for novel cancer therapies.
• Further research is needed to confirm reliable combinations of CD44, CD24, and other markers for CSC isolation.
• Clarifying the role of these markers is essential for developing effective CSC-targeting strategies.