Caitlin Leggett said a persistent rash was the only sign something was wrong before her diagnosis.
A woman given six months to live after her leukaemia returned says the thought of leaving her identical twin sister alone is "unthinkable".
Caitlin Leggett, 24, from Cardiff, was diagnosed with acute myeloid leukaemia (AML) - an aggressive cancer of the white blood cells - in April 2025, with a persistent rash the only sign that something was wrong.
She went into remission after chemotherapy and later had a stem cell transplant, but was told in May the cancer had returned and that treatment options in the UK were unlikely to be curative.
Caitlin is now pursuing potentially curative treatment abroad - most likely in the US - where treatment and associated costs could reach £500,000.
"We're only 24 - nobody expects this to happen... Being twins as well, you're not supposed to have one twin not be there," said Caitlin's sister Grace.
"It's unthinkable," Caitlin added.
"We've gone through life together and I don't want our story to end here."
The sisters, who have always been close and lived together at university, only discovered they were identical twins after Caitlin's diagnosis.
They had been believed to be fraternal twins because they developed in different amniotic sacs, but doctors found their markers were exactly the same while assessing Grace as a potential stem cell donor.
While the news came as a surprise, it also complicated Caitlin's treatment as Grace was no longer eligible to donate her stem cells to her sister due to their near-identical DNA.
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