The Health Minister says human error is to blame after a dozen patients were wrongly given the all-clear after undergoing screening for bowel cancer at Wexford General Hospital.
One man is understood to have died after the misdiagnosis.
A recall of 600 patients at Wexford General Hospital is almost complete, and management says a report on the matter is in the final stages of preparation.
Minister Leo Varadkar says mistakes will happen when it comes to testing.
Meanwhile, the Irish Cancer Society says waiting times for colonoscopies in University Hospital Kerry are positive.
The group is expressing very serious concerns following the misdiagnoses revelations in Wexford General Hospital but adds that it does appear to be isolated.
The society says the screening process for bowel cancer has been successful to date and is urging everyone to continue to participate in the scheme.
Policy Officer with the Irish Cancer Society Paul Gordon says it is disappointing that the HSE has revised targets for cutting waiting times downwards for colonoscopies.
However he says a new unit in Kerry is helping waiting times here: