The head of the HSE, Professor Brendan Drumm, has said there may be a third case of cancer misdiagnosis at Mid-Western Regional Hospital in Ennis.
But he said the case still had to be validated.
FG Health Spokesman Dr James Reilly said this latest case demands that an independent inquiry take place.
He said that 'this independent inquiry must happen as a matter of urgency.'
The HSE West issued a statement saying it is aware of a number of other concerned patients following the recent issues at Mid-Western Regional Hospital.
It said that these concerns are being addressed with each of the patients are it is seeking to address their issues.
Meanwhile the Director of the National Cancer Strategy, Professor Tom Keane, has said he does not believe much would be learned from independent inquiries into breast cancer misdiagnoses in Ennis.
He said there were systems errors made in both the cases of Ann Moriarty and Edel Kelly, but the likelihood of a repeat of such errors in the future have been significantly reduced.
Speaking on RTÉ Radio's News At One, Professor Kean said Ms Kelly's case highlighted the need for the creation of centres of excellence to treat cancer.
A senior cancer specialist has said independent inquiries into breast cancer misdiagnoses of two women at Ennis General Hospital may not be of value to the public in general.
Professor Arnold Hill, the national advisor on surgical oncology at the National Cancer Control Programme, has said vast improvements have been made to services recently.
Speaking on RTÉ Radio's Morning Ireland, Prof Hill said it was now a safe time for breast cancer management.
