The presumed process for fighting cancer using Nano worms:
STEP 1: Doctors inject train-like nanoworms into a vein, and the worms circulate through the body.
STEP 2: Coated with tumor-specific proteins, the worms home in on the cancer. Their elongated shape allows
the proteins to latch onto the tumor at multiple points.
STEP 3: Doctors perform an MRI on the patient. The iron-oxide worms react strongly to the magnetic scanner, producing brighter images of young tumors than traditional scanning techniques do.
STEP 4: The medication can be released using enzymes, heat or a time-release mechanism.
http://www.popsci.com/node/24500
http://schickfoundation.org/