In 2012, Tom collapsed on stage during a performance at the Sydney Opera House.
‘They [doctors] said two to three years,’ the actor told the Sunday Project.
‘Essentially, I thought, that's it.’
Tom is due to travel to the US this week to undergo a groundbreaking new treatment that he hopes will give him longer with his new wife Rebecca.
The treatment, called Car T-Cell therapy, aims to boost the immune system by harvesting white blood cells and genetically modifying them before re-introducing them.