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17 February 2015, 07:12
Heart's been speaking to a nine-year-old boy from Hampshire - diagnosed with testicular cancer.
Jack Bristow from Basingstoke is believed to be one of the youngest people in the UK to ever have got the disease as it's very rare in children.
He's being treated at Southampton General Hospital - and has just finished his second round of Chemotherepy.
Doctors say he has a 95 per cent chance of going into remission after the treatment.
Heart's Charlotte Wright has been speaking to Jack - as well as his parents, Jo and Dan Bristow.
Hear the full interview below: