Hospital chiefs successful County Durham person agreed to reappraisal up to a further 4,500 bosom crab cases aft failings including delayed diagnoses and unnecessary surgeries were found.
Hundreds of patients suffered harm nether County Durham and Darlington NHS Foundation Trust, according to a reappraisal of cases dating backmost to 2023.
The BBC has spoken to aggregate women affected by the failings, including 1 who said she felt "mutilated" and the trust's mistakes were "absolutely unforgivable".
Ahead of agreeing to grow the reappraisal to cases dating backmost to 2015, members of the trust's committee offered "sincere" apologies for the failings and harm caused.
At an bonzer gathering of the committee held successful Durham, committee seat Alison Marshall said: "I would similar to connection a sincere apology to each the women and their families who person been affected by the failings successful our bosom services.
"I can't ideate the interaction that has had."
She said they could "not crook backmost the clock" but would beryllium "open, honorable and transparent" astir the failings.
Chief caregiver Gill Hunt told the committee concerns were archetypal raised successful 2015 aft a "service reconfiguration" and nonaccomplishment of bosom surgical trainee posts.
Over the pursuing years patients and bodies specified arsenic the Northern Cancer Alliance, Care Quality Commission and NHS England raised aggregate issues, she said.
The cardinal "themes" included attraction "not aligned to champion practice", excessive country and delayed diagnosis, she said.
The trust's bosom country lookback reappraisal began successful April 2025 by examining cases betwixt January 2023 and February 2025.
Hunt said 538 cases had been reviewed truthful acold with 321 having experienced immoderate signifier of harm, including 1 death.
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