Up to 270 women in the United Kingdom could have died of cancer due to a "computer algorithm failure" dating back to 2009 under the NHS' breast screening programme - British health secretary Jeremy Hunt said today.
Jeremy Hunt "apologised wholeheartedly" for the "eight-year oversight", says the i.
Checks are offered to women aged 50-70 every three years, but those affected were aged 68-71, with the issue dating back to 2009.
Of these, 150,000 have died since and the remaining 300,000 are aged in their 70s, the BBC said.
Mr Hunt said the issue "came to light because an upgrade to the breast screening invitation IT system provided improved data to local services on the actual age of the women receiving screening invitations".
Breast cancer makes up almost 50% of all cancers diagnosed among women in Wales aged between 35 and 54 and accounts for almost a third of all cancers in all women.
The 309,000 women thought to be affected by the issue will be contacted by the NHS this week.
Women who are concerned about whether they had missed a screening can call 0800 169 2692.
"The whole journey I went on, the traumatic journey, all the treatment, may never have had to have happened".
AROUND 270 women may have died after a computer error prevented them from being notified of their final breast cancer screenings.
GPs' leaders said they were "shocked" to learn of the error and said the implications for Global Positioning System would potentially be "significant".
Overall, 450,000 women were not invited for breast cancer screenings.
A Public Health England spokesman said the problem was identified in January 2018 whilst reviewing the progress of the age extension trial, which upped the age group eligible for screening.
"The Welsh administration doesn't believe that this problem has affected them, even though they were using the same IT system that we were using in England, but that is their view".
The independent review will be chaired by Lynda Thomas, chief executive of Macmillan Cancer Support, and Martin Gore, professor of cancer medicine at the Institute of Cancer Research and a consultant medical oncologist at the Royal Marsden Hospital.
Labour's Jonathan Ashworth, the shadow health secretary, said the revelations were "terrifying for hundreds of thousands of women across the country".
Hunt also stated that any women who would like a mammogram will receive one within six months.
Two years later she was diagnosed with breast cancer.
'We must also recognise that there may be some who receive a letter having had a recent terminal diagnosis.
On Wednesday Mr Hunt said "administrative incompetence" meant some families may have lost, or may be about to lose, a loved one to cancer.