John Bongard credits his comeback from prostate cancer to his GP's regular ordering of a controversial blood test.
Mr Bongard, the former chief executive of Fisher & Paykel Appliances, spoke of his recovery to support the Prostate Cancer Foundation's Blue September campaign to raise money and awareness about the disease.
"There are varying doctors' opinions on the effectiveness of PSA [the prostate-specific antigen blood test] as a guide for prostate cancer," Mr Bongard said. "But I tell you what, they're the three best letters of the alphabet I can think of right now.
"If it wasn't for PSA it would probably have been some time further out into the future before my cancer was detected and that may not have given me as good a chance of surviving as I have right now."
His body at present has no evidence of cancer. Aged 57 now, he was diagnosed in 2008 by a biopsy of his prostate gland following a rectal examination that was indicated by a rise in his PSA level. His GP had been monitoring Mr Bongard's PSA level six-monthly since he turned 50, but increased this to every three months, then monthly, after it began to rise.