Is it true that some somatic stem cells in our bodies can be the source of common cancers?

So-called cancer stem cells are cancer cells that have stem cell-like properties, i.e., they can self-renew and differentiate into other cell types. They are associated with some, but not all, types of cancers. Data suggest that recurrence of some cancers is caused by a failure of current therapies to target and kill these cancer stem cells. However, the relationship between cancer stem cells and somatic stem cells is unclear. Somatic stem cells can become cancerous, but cancer stem cells do not necessarily come from somatic stem cells.