It is hoped the discovery will lead to improved treatments for people with aggressive breast cancer.
Harri was diagnosed with a rare leukaemia after his mother took him to the doctor with a scratch on his eye.
The car flipped over and then crashed into the central reservation on the A4232 near Cardiff.
Cardiff City sign Nantes striker Emiliano Sala for an undisclosed club-record fee.
Swansea City centre-back Joe Rodon faces six weeks out after breaking a metatarsal in his foot.
South Wales Argus
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