Some caution may be called for here. The Japanese have reportedly discovered how the Tardigrade achieves its radiation immunity, namely by encasing its DNA in a protein sheath. Swell. If they can do it, so can we, presumably using gene-splicing techniques to add the sheath to our DNA. Just think, real estate developers will be swarming in to the now abandoned land near the Chernobyl to sell to a rather exclusive group of clients, and nuclear war will no longer threaten the existence of humanity. Just the fraction that can't afford the upgrade, who probably wouldn't be missed anyway.
My question is this: If someone is upgraded to radiation immunity, and then develops cancer of some sort, are the cancerous cells also radiation immune?