Asked if it meant that someone in Wales was walking around completely immune to cancer, Prof Sewell said: “Possibly. This immune cell could be quite rare, or it could be that lots of people have this receptor but for some reason it is not activated. We just don’t know yet.” 

Immune cell that kills most cancers discovered by accident by British scientists https://www.telegraph.co.uk/science/2020/01/20/immune-cell-kills-cancers-discovered-accident-british-scientists/?WT.mc_id=tmg_share_tw via @TelegraphSci