Now this trojan horse would be 'the bomb'!

Researchers at M.I.T. have developed a molecular size anti-cancer bomb. Injected into the bloodstream, it apparently acts as a trojan horse by seeking and burrowing deep into the tumor. Once inside, the outer coating disintegrates and the drug inside gradually collapses the blood supply which feeds the tumor, but is reported to leave all healthy tissues undisturbed.

It sounds like the technique holds great promise, but I can't help but wonder how it finds the tumor and distinguishes it from other tissues, lumps and bumps...