TREATMENT given to a terminally ill cancer patient of Paschal Carmody's was not appropriate, an expert said.
Professor Frank Sullivan said that he would not consider photodynamic therapy (PDT) appropriate in the care of 15-year-old Conor O'Sullivan.
Conor's parents Christina and Derek O'Sullivan had been told in June 2002 that their son had six months to live.
A rare bone cancer had spread to the youngster's skull, thigh and collar bones. Conor died in November 2002.
But in July 2002 the O'Sullivan travelled to Dr Carmody's East Clinic in Killaloe after meeting a cancer patient of Dr Carmody's who was alive six years on, after being given three months to live.
After a consultation with Dr Carmody on July 9, 2002 the O'Sullivans agreed that Conor undergo a course of PDT.
The O'Sullivans have told the trial that Dr Carmody told Conor that he could cure his cancer or at worst keep him alive. Dr Carmody denies uttering those words.
On the fifth day of the deception trial at Ennis Circuit Court, Prof Sullivan said: "I would never consider a deep-seated bone tumour like this to be appropriate for PDT".
The late John Sheridan suffered from liver cancer and underwent PDT treatment under the care of Dr Carmody during 2001 and 2002. Mr Sheridan died in November 2002.
Asked to comment on Mr Sheridan receiving PDT, Prof Sullivan said: "There is no way this type of light treatment could penetrate."
Dr Carmody denies seven deception charges, totalling €9,610, between July and October 2002.
He also denies obtaining by deception €6,944 from John Sheridan of Kells, Co Kilkenny, in November 2001 through the administration of PDT.
The trial continues.