READ MORE
• Cancer: Are poor being sent home to die?
• Victims, experts lobby for 'breakthrough' drug
• Craig's story: The exorbitant price of staying alive
• Bob's story: Drug lets grandpa tick off bucket list
• Melanoma New Zealand: Access to effective therapies vital
In 2010, Mrs Renwick had a mole removed from her lower back. It was later diagnosed as melanoma and a wider cut was made to make sure of removing any tumour cells. She thought she was fine.
But in May this year she began feeling queasy at school on a Wednesday. On the Thursday a GP found nothing serious. By the Friday her abdomen was swelling. Saturday "I started to look pregnant" and on the Sunday she went to Tauranga Hospital.
"A few days later they said, 'You've got stage 4 melanoma, you are going to die'."
The hospital sent her home with painkillers but also gave her a card for a private cancer centre in Auckland. The cancer centre arranged a test for the gene mutation that can make melanoma susceptible to the drug dabrafenib.
The result was positive and a Tauranga Hospital oncologist got her on to the drug.
The tumours, mainly in her abdomen, had started spreading to her brain, but the drug's effects were dramatic.
"A CT scan at the start of August showed a complete response - all the cancer had gone," says Mrs Renwick.
"In America they call it the Lazarus effect. You are about to die and suddenly the dabrafenib pulls you out of the grave."
When melanoma becomes resistant to dabrafenib, Keytruda is the brightest hope for patients who can pay. Neither drug is funded by Pharmac, but Mrs Renwick managed to get dabrafenib at no charge on a compassionate programme run by its supplier.
She is shocked New Zealand has been divided by costly drugs.
"It seems to me in this country the rich people are able to get treatment and the poor people aren't. They are sent home with lots of pain-killing drugs. They are sent home to die. I think that's really wrong."
"It does come down to how much money you are able [to pay]. Getting sick makes you really value life somehow. I think everyone would be willing to pay to live, but are they able to?"
Although Keytruda doesn't work in everyone, it is a drug the Renwicks could not ignore.
"I'm not ready to go. I've got so much to live for," Mrs Renwick says.
"I have known my husband Wayne since I was 19 and he is still the best man I have ever met. I want to grow old with him. I want to see our children grow to meet their potential and, if it is their wish, to have families of their own."
The Series
Monday: Breast Cancer
Tuesday: Bowel Cancer
Yesterday: Lung Cancer
Today: Melanoma
Friday: Prostate Cancer
Friday: Prostate Cancer