Lots of things work in vitro, this apparently included. Arsenic probably would too. Cell culture is a very different environment from a living organism, so all

Lots of things work in vitro, this apparently included. Arsenic probably would too. Cell culture is a very different environment from a living organism, so all this says about whether the same drug works the same way in vivo is that it's worth finding out. Despite the usual mild tendentiousness one finds in press releases from academia, the linked article says as much, repeatedly and in detail.