Are Leukaemic Stem Cells Restricted to a Single Cell Lineage?

Area of Science:

• Oncology
• Stem Cell Biology
• Genetics

Background:

• The cancer-stem-cell theory posits that cancers originate from a hierarchical cell structure, mirroring normal development.
• Studies indicate that at least two genomic insults are necessary for cancer development, without conferring inherent survival advantages.

Purpose of the Study:

• To review evidence supporting the cancer-stem-cell theory.
• To highlight the differences in developmental versatility between normal and cancer stem cells.

Main Methods:

• Review of existing research findings on cancer stem cells.
• Analysis of studies involving transgenic mice with specific oncogenes (LMO2, BCR-ABLp210) in hematopoietic stem cells.

Main Results:

• Transgenic mice models recapitulated human leukemias (T-lymphoblastic and chronic myeloid leukemia) when oncogenes were activated in hematopoietic stem cells.
• Cancer stem cells exhibit 'hardwired' lineage affiliation, differing from the versatile differentiation pathways of normal hematopoietic stem cells.

Conclusions:

• A critical difference between normal and cancer stem cells is the restricted developmental versatility of cancer stem cells.
• This lack of versatility in cancer stem cells is a key characteristic supporting the cancer-stem-cell theory.