User blog comment:DeltaSquad5/Question for you - Extraterrestrial abilities.../@comment-1197011-20140725165210/@comment-998602-20140726100313

I think the TARDIS is a cyborg, as it's a machine but still has a living essence. Plus, the Doctor said they were grown on Gallifrey and not built.

In one of the Doctor Who comics with the 8th Doctor, a human girl called Compassion did get transformed into a TARDIS although she had mixed reactions to it. http://tardis.wikia.com/wiki/Compassion