CSCs set to improve cancer treatment

Research into cancer treatment is currently focusing on cancer stem cells (CSCs), which are responsible for some instances of the disease. Indeed, a University of Rochester Medical Center researcher has resolved the controversy and promise around a dangerous subtype of CSCs, which seem capable of resisting many modern treatments. The research, published in the 26th June edition of Science (2009;324:1670-1673), proposes that this subpopulation of malignant cells may one day provide an important avenue for controlling cancer, especially if new treatments that target the CSC are developed and combined with traditional chemotherapy and/or radiation.

Research from the past ten years suggests that because CSCs may be the root of cancer, they might also provide a new opportunity for a treatment. A group of collaborators, for example, are testing a new drug compound based on the feverfew plant that demonstrates great potential in the laboratory for causing leukaemia CSCs to self destruct.

Further, it was recently reported that researchers at the University of California, Los Angeles Jonsson Comprehensive Cancer Center, on a quest to find lung cancer (LC) SCs, have developed a unique model to allow further investigation into the cells that many believe may be at the root of all LCs. Since CSCs are known to possess unique properties and a predisposition to metastasise, the study's lead author proposed to extract candidate CSCs directly from clinical specimens based on the markers they express and then validate these cells functionally. As detailed in PLoS ONE (10.1371/journal.pone.0005884), in an effort to find LC SCs, the team collected specimens from patients with malignant pleural effusions, and created a microenvironment in which the tumour cells would remain heterogeneous and enable researchers to more easily identify candidate CSCs.

Separately, a study from the University of Michigan (UM) Comprehensive Cancer Center recently indicated that a gene well known to stop or suppress cancer plays a role in CSCs. The researchers found that several pathways linked to the gene, PTEN, also affected the growth of breast cancer SCs. Further, by using a drug that interferes with that pathway, the scientists produced an up to 90 per cent decrease in the number of CSCs within a tumour. As detailed in PLoS Biology (10.1371/journal.pbio.1000121), the UM researchers deleted PTEN in tumours grown in cell cultures and mice, and found an increase in the number of SCs. They also looked at pathways associated with PTEN and reported that the pathway, PI3-K/Akt, regulated the CSC population by activating another SC pathway, Wnt, which is also implicated in multiple cancer types. Thus, new and recent developments seem to reiterate the important role of CSC research in future treatment.

Alice Rossiter
Cancer Drug News - Editor