Brunton, a 41-year-old Remuera software accountant, has been battling an aggressive form of blood cancer since January. About a month ago his condition escalated dramatically, spreading to five tumours around his body.
His doctor had begun prepping him for palliative care as there is no further treatment available for him in New Zealand.
Now, thanks to a ground-breaking immunotherapy treatment in Boston, the family has been given one last hope.
"He landed safely, travelled well and tells me he is feeling good. He's flying from LA to Boston tomorrow," Brunton-Rennie told the Herald this morning.
Thousands of New Zealanders have been getting behind Brunton's fight with more than $180,000 raised on his Givealittle page in the last two weeks.
With the steep overseas treatment cost, more than $1.5 million is needed.
The Herald will be posting regular video updates from Brunton as he embarks on the biggest fight of his life.