Dr Reuben Broom, Medical Oncologist from Auckland, said the treatment represents a significant advance for more than 400 New Zealand women who are diagnosed with the common type of advanced breast cancer.
Lower Hutt mother-of-three Mary Margaret Schuck credits the drug for halting the growth of her cancer which was originally diagnosed in 2010.
Since being told in November that she was in the advanced stages the Massey University tutor searched for something that could buy her more time.
She discovered Ibrance in Malaysia and has been buying it at a cost of $7500 for a three month supply but is unsure how long that can continue.
"I've got three teenagers...given where they are in their lives it's really important that we put the cancer at bay for as long as possible."
Although it has been well worth it, it was gut-wrenching for her to know that so many others, including friends, were missing out on the drug due to the exorbitant cost.
"There has been no change [in cancer growth] for the past year which I'm very grateful for and I'm very, very conscious how lucky we are that we are in a position that we can do this because I have a number of friends here who can't."
Even though she pays $30,000 it was still half the cost of what it was currently in New Zealand - $60,000.
The drug helped with her fatigue which used to be constant.
"I was having huge amounts of fatigue before I started taking it ... when it started working I felt much, much better."
However, she feels she is beginning to build an immunity but said she was still in a better place for having taken it.
"For most women who take this drug it increases the length of time before the cancer progresses by a year or so and in some cases more than that. I know women who have been taking it for four or five years now."
Although she urged Pharmac to fund it, she wasn't sure if it would ever happen.
"They've got such a backlog at present that they're not likely to look at this for years."
Ibrance is taken as an oral pill and produced by the pharmaceutical company Pfizer. The company confirmed the treatment is not currently funded.
In a statement, Pharmac director of operations Sarah Fitt said the agency had been "actively engaging" with Pfizer, which is the only supplier of the drug.
"Pharmac is looking forward to receiving a funding application, and considering Pfizer's medical evidence in depth.
"Pharmac will be in a position to make a fulsome comment on this treatment once our review is complete."
Labour's health spokesman David Clark said Pfizer had announced a worldwide clinical trial of the drug for 500 people, including some Kiwis.
As one of its election health promises, Labour had proposed a National Cancer Agency which would provide more even access for clinical trials which were currently haphazard in nature.
A spokesperson for Health Minister Jonathan Coleman said he couldn't comment on Pharmac's funding issues.
