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Incidentally, what makes this approach (somewhat) novel is that they are using alpha (ionizing) radiation. It kills cells, but has a very short distance of effectiveness. Basically it's the same principle as radio-iodine being used for thyroid cancer, but being applied to other forms of cancer. Personally, I think it's just a lot of hype. Unless you can attach those alpha particles to something that will be readily absorbed by the cancer cells (such as iodine in the thyroid), their range of effect is not enough to kill all of a tumor of a significant size. And if the tumors are too small, then detection and delivery by needle just isn't a very feasible solution.

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