Detectives are working to establish how many more children may have been abused by a doctor who has been jailed for 22 years for abusing boys in his care.
Myles Bradbury, 41, from Herringswell, Suffolk, worked as a paediatric consultant haematologist at Addenbrooke's Hospital, Cambridge, where he carried out medical examinations on 18 boys, aged between 10 and 16, "purely for his own sexual gratification", Cambridge Crown Court heard.
The judge described him as the worst paedophile he had ever seen, in terms of how he abused the trust of vulnerable people.
All of the victims suffered from leukaemia , haemophilia or other serious conditions. Some have since died.
Bradbury is known to have abused children throughout his five year career at Addenbrooke's but previously worked in other parts of the country, including Birmingham Children's Hospital.
Detective Superintendent Gary Ridgway, from Cambridgeshire Police, said his team was now working with police forces and other agencies in various parts of the country to see if his abuse dates back further.
He added that since Bradbury's crimes were reported in the press, a "small number" of other possible victims had come forward and these files have recently been passed to the Crown Prosecution Service.
Encouraging victims to contact police, Mr Ridgway said: "It would be naive to assume that we know the full scale of what he did.
"We are determined to make sure we have given every possible opportunity to victims to come forward, speak about what they experienced and find justice."
The officer explained that when Bradbury's home was raided, he had already disposed of his laptop and, although this has since been recovered, he had removed its hard-drive.
"He made every effort to hide the full scale of his offending," Mr Ridgway said.
"The fact that he did this to his laptop is in itself an indication that we may not yet know everything that he did."
The NSPCC has set up a helpline for those affected by his crimes and so far at least 54 parents and members of the public have been in touch.
Bradbury, who filmed some victims using a spy pen and abused others behind a curtain while their parents were in the room, p leaded guilty to 25 offences, including sexual assault, voyeurism and possessing more than 16,000 indecent images.
Placing him on the sex offenders register for life and making him subject to a sexual offences prevention order, Judge Gareth Hawkesworth said: "I have never come across a more culpable and grave course of sexual criminality which has involved such a gross and grotesque breach and betrayal of your Hippocratic Oath and trust reposed in you by your patients, their families and colleagues.
"There are almost too many aggravating features to enumerate in this prolonged, carefully planned, cruel and persistent campaign of abuse.
"At the top of this comes the breach of trust."
The sentence means Bradbury will never see his daughter, born during the police investigation, unsupervised.
He was sacked from his job earlier this year and will never work as a doctor again, the court heard.
Prosecutor John Farmer said the defendant had a "long-standing, unlawful, sexual interest in boys".
He added: "The defendant, through the trust he had acquired, circumvented the procedures and encourages a number of young patients to see him alone.
"It was in these circumstance under the guise of legitimate examinations he went entirely beyond the bounds."
He abused the boys " for his own personal gratification".
"On some occasions, when he failed to exclude the parent, he simply carried on behind the curtain behind which the boy had gone to remove his clothes."
The offences took place over four and a half years, beginning within six months of him taking up his post in 2008 and continuing to the day he was suspended when the first concerns were raised.
At some point, he began using a camera pen in an attempt to gain images of the boys when partially clothed, Mr Farmer added.
Police found 170,425 images on this pen but none of these were classed as indecent.
Mr Farmer explained Bradbury was first arrested in December 2013 after police were alerted by Canadian authorities that he had bought a DVD containing indecent images of children as part of Operation Spade.
At that point Cambridgeshire Police were already investigating after concerns were raised about his conduct.
Bradbury, who, the court heard, was also involved in church and Scout groups, was described as "a man of great charm and persuasiveness" whom everybody trusted.
In mitigation, Angela Rafferty said Bradbury's guilty pleas had spared his victims the ordeal of giving evidence in court.
She added: "Clearly on a human level something has gone very badly wrong in this man's life and thought processes."
Dr Keith McNeil, chief executive of the Cambridge University Hospitals Trust, offered his condolences to the families of those targeted by Bradbury.
"Today's sentencing of Bradbury cannot undo the damage he caused but he is finally behind bars and is no longer a risk to vulnerable children," he added.
"The lengthy sentence shows Bradbury's abhorrent betrayal and manipulation of his position as a doctor has been fully recognised."
John Cameron, head of the NSPCC helpline, encouraged anybody affected by Bradbury's crimes to seek help.
He said: "At some of the lowest points in their lives, countless families placed their trust and hope in Bradbury.
"His sexual abuse and perverted voyeurism of extremely vulnerable children was a grotesque betrayal of that trust."
The NSPCC helpline is available 24 hours a day, seven days a week on 0808 800 5000 or firstname.lastname@example.org.