Here is a link to some info regarding dormant tumor cells.
This was also a subject of great interest at the Era of Hope...
The DoD has funded a study that so far is showing dormant cells in mice that "wake-up" after being in their sef induced sleep. The overall take is that we have these dormant cells and have yet to find the trigger that perks them up. The cells are somehow immune to chemo agents. I will try to find the Era of Hope study and post later.
Here is some aditional info not related to the Era of Hope study:
http://cancerres.aacrjournals.org/cg...ract/67/9/4491
Maria