The positive young woman, originally from Abergele, was given the all-clear at Clatterbridge Centre for Oncology after she was diagnosed with the rare brain tumour, chordoma, at the age of 14.
"It is fantastic news. It didn't play on my mind, but it is a relief."
Sian, 25, has continued to lead a normal live over the last few years and moved to Norwich to study Bio-Chemistry at the University of East Anglia.
As her treatment for the rare tumour had damaged her pituitary gland, which affected her hormones, she decided not to continue with the course and now works as an admin supervisor for insulation company, Mico.
She still visits her family of Peel Street, Abergele as often as she can.
Sian travelled to America at the age of 15 after members of the community raised an amazing £27, 000 for the Sian Moore Appeal. Sian told how the journey changed her life and made her appreciate the things around her.
"The hardest part was going away to America and having the treatment to save my life, after that it did get easier."
Sian's agonising battle began when she suffered problems with her right eye, which began to turn inwards making her see double.
She was taken to hospital by her parents, Mary and Tony, who did not expect the diagnosis to be serious. The rare tumour was discovered and the brave teenager underwent a major operation at Alder Hey children's hospital in 1998.
ssShe was forced to endure a race against time to raise money to fly to Boston, Massachusetts to remove part of the tumour, which could not be removed by the surgery. Sian explained how the doctor in America had to call surgeons in another country to seek advice, as the tumour, which was on the brain stem, was so rare.
Sian, who lives with a housemate, hopes to stay in Norwich and is keen to go back to university one day.