A children's doctor who abused boys as young as eight in his care will return to court today ahead of his sentencing.
Dr Myles Bradbury has been warned he faces a substantial sentence after admitting carrying out examinations on children "purely for his own sexual gratification" and with no medical justification.
His victims included cancer sufferers and those being treated for blood disorders.
The 41-year-old, who worked as a paediatric haematologist at Addenbrooke's Hospital, in Cambridge, pleaded guilty to seven counts of sexual assault and 12 counts of engaging in sexual activity with a child at an earlier hearing at Cambridge Crown Court.
He also admitted three counts of causing or inciting a child to engage in sexual activity, one count of voyeurism and two counts of making indecent images of a child.
Today the court will hear mitigation from Bradbury's counsel with his sentence being expected to be delivered on Monday.
After his guilty pleas, Camb ridgeshire Police confirmed that "there are likely to be more victims", adding that a helpline can be called if parents, patients or former patients have any concerns.
His offences involved 18 victims aged from eight to 17, and were carried out between 2009 and last year.
His abuse came to light after a victim spoke to his parents about what had happened and Bradbury was suspended by the NHS last November before being arrested the following month.
He was charged with 11 offences in June but more counts were added to the indictment last month after further victims came forward following publicity.
Bradbury pleaded not guilty to a count of sexual activity with a child and a count of sexual assault, which Judge Gareth Hawkesworth said will probably remain on file.
His case is among those which has attracted criticism after Canadian police passed details of suspected paedophiles to UK forces as part of Operation Spade.
In many of the cases, there were long delays in officers acting on the tip-offs.
Figures obtained by the Press Association earlier this month showed more than 200 suspects are still being investigated after the information was first passed to the Child Exploitation and Online Protection Centre in July 2012.
Anyone with concerns about Bradbury's conduct can call the helpline set up by Cambridge University Hospitals NHS Trust on 0800 389 8625.