It does, from the article: "“Normally, our blood vessel walls are all sealed pipes,” Brahmbhatt says. “But around wherever the cancer is growing, the blood vessels are known to be very defective. They have got a lot of holes in them.”

Brahmbhatt and his collaborator Jennifer MacDiarmid devised a clever ploy. They would send a Trojan horse into malignant cells and turn cancer’s own trickery against it.

The Trojan horse, in this case, is a product of a harmless bacteria that’s been genetically engineered to have specific qualities. When this genetically engineered bacteria divides, it yields a tiny non-living cell of 400 nanometers in diameter—the right size to slip through the damaged vessels and mingle with the tumors."