Cancer campaigner Vicky Phelan has said there are signs that her cancer is responding to new drugs in the US.

Ms Phelan has been in Maryland since January of this year while taking part in an immunotherapy drug trial.

Speaking on RTÉ's Ray D'Arcy Show, she said that she has had three doses of the drug.

Ms Phelan said she is hoping this will work and her blood levels are showing signs that the cancer is responding to the treatment.

In 2018, Ms Phelan was awarded a €2.5m settlement by the High Court in a case taken against the US laboratory that carried out her cervical smear test.

She was diagnosed with terminal cancer after a false negative cervical smear test carried out as part of CervicalCheck.

In her interview today, she said that she is due to have a scan on 23 March.

If there is no change and her tumours are the same size or have grown, she will be taken off the trial that day, she said.

Ms Phelan said the new drug is a very similar drug to Pembrolizumab, which she has responded well to in the past.

She said her doctor said half of the people on the trial have responded well to the new drug.

Ms Phelan said it was tough been away from her family, as she missed her son Darragh's tenth birthday last weekend.

"It was a tough weekend ... it was the first one I missed ... but I'm logical and I say to myself: 'I'm not there for this one but hopefully I'll be there for the next one'."