Lynda Topp has been forced to stop chemotherapy for her breast cancer due to a "nerve damaging side effect".
An update on the Topp Twins Facebook page revealed they're trying to "stay positive everyday".
"Lynda has had to stop her chemo treatment due to chemo induced peripheral neuropathy which is a nerve damaging side effect of the weekly chemo she was receiving," the statement said.
"Symptoms are tingling, pain, numbness and reduced balance in her feet. She is currently receiving acupuncture treatment and natural plant based remedies as there is no known cure for this.
"Jools is feeling well and is still waiting on a scan to see if radiation has reduced the tumour in her rib cage.
"The twins continue to smile and stay positive everyday and would also like to acknowledge all the other women out there in New Zealand who are going through cancer treatment."
In August, the Topp Twins spoke about their cancer fight, saying it had been a "pretty hard journey".
The pair revealed in March they'd been diagnosed with breast cancer.
Jools had first been diagnosed with the disease in 2006 but beat it after her left breast was removed and she underwent weeks of gruelling chemotherapy.
