The mother, who lives in Norfolk, said her son was taken out of education completely a few years ago and now spends most of his time in complete seclusion.
Aged between 10 and 12 when he was abused, the teenager has felt unable to see a doctor since the revelations about Bradbury first emerged three years ago, his mother said.
"Myles Bradbury destroyed our beautiful boy's life," his mother said.
"So much so that I can't see any way that he'll ever recover.
"He is so bad that we live in fear of him committing suicide.
"We have to watch him 24 hours a day. The first thing we do every day when we wake, we check to see that he is still alive. If he is a bit late getting up we are worried that he will have done something terrible.
"It is completely heartbreaking. He hides away pretty much all day and refuses to leave the house.
"Whilst he has us around I hope he will be okay, but I feel that if we were not around, he'd do something awful."
Dr Myles Bradbury
Registered as a haematologist in 2007
Bradbury had access to 128 young people between April 2012 and March 2013, during a study of malignancy
Following Bradbury's arrest, a registrar at Addenbrooke's noticed from records he seemed to be "awfully focused" on puberty
He used excessive puberty checks as an excuse to assault patients, while their parents sat unaware the other side of the curtain
One mother watched Bradbury slip his hand under her daughter's top without warning, but she did not want to question his professionalism
Bradbury visited an orphanage in Swaziland in 2012 as part of a team helping 300 children
Sources: General Medical Council, Cambridge University Hospitals NHS Foundation Trust, Royal College of Paediatrics and Child Health
Bradbury, of Herringswell in Suffolk, admitted 25 offences, including sexual assault, voyeurism and possessing more than 16,000 indecent images.
The blood cancer specialist used a spy pen to take pictures of his victims.
That device was found to hold 170,425 images of "boys partially clothed... none indecent", Cambridge Crown Court heard at the time of his sentencing.
The images of his victims, some of whom had haemophilia, leukaemia and other serious illnesses, were gathered at Addenbrooke's Hospital.
Renu Daly, of Hudgell's solicitors, said although some claims have been settled with the hospital, eight cases relating to child victims were ongoing, including some in which the victims suffered "catastrophic psychological injuries".