Parents affected by the Alder Hey organs scandal said they were "delighted" with the decision to strike off Professor Dick van Velzen.
Pity II said they now feel that some justice has been achieved
Members of the PITY II support group called for him to be banned from practising across the world.
Alice Proctor, a spokeswoman for the group, said: "We are only sorry that the CPS felt unable to proceed with a case to prosecute."
Professor Van Velzen was found guilty of serious professional misconduct.
The General Medical Council (GMC), sitting in Manchester, reached the decision on Monday.
Mrs Proctor said: "Professor Van Velzen did not appear at the hearing, nor send legal representation and treated it with what can only be described as contempt.
"Over the past five-and-a-half years his actions have been strongly condemned by the medical profession, not only in this country but also around the world and we are pleased that today the GMC has shown its moral courage by striking this man off its register and holding him accountable for his actions.
"We would hope that this ruling will reach further than the UK and that other countries will consider the damaging effect he had before they offer him future employment.
"Dr Van Velzen was struck off in Canada and has now been struck off in England.
"He should never be allowed to practise pathology ever again anywhere in the world."
She added: "Pity II now feels that some justice has been achieved and this may help in some small way to rebuild the damaging effect it has had on many lives and allow families to move forward with their lives."