The phrase "invasive cells" refers to abnormal cells that can spread from the original site where they started to other parts of the body. Full definition
That agent is thought to increase production of T cells, which identify and kill invasive cells. (discovermagazine.com)
Firstly, invadopodia - like protrusions form at the ventral surface of invasive cells; later, one protrusion elongates that lastly drives the infiltration of cells into the underlying compartment. (science.institut-curie.org)
In a tumor, the faster growing cells «piggy - back» along with the more invasive cells, so together they can be more effective in establishing a new tumor once they have reached different parts of the body. (sciencedaily.com)