For this study, she and her colleagues exposed mice to radiation and drugs used in chemotherapy, then monitored changes in the color of their fur as well as the status of their stem cells.
Some might be in action soon. For example, it seems that cancer stem cells are less vulnerable to radiation than other cancer cells, because their DNA-repair mechanisms are better.
The actual target was breast cancer stem cells, the cells from which cancers grow and metastasize, and which tend to resist drug and radiation treatments.