Building work on a new research unit, named after one of Oxford's most famous scientists, has been marked with a tree planting ceremony.

Developers have started preparing the Old Road site, next to the Churchill Hospital, Headington, ready to construct the Richard Doll Trials and Epidemiology Building.

The centre, which will house vital research on cancer, heart disease and strokes, has been named after Sir Richard Doll, former Regius Professor of Medicine at Oxford University, who identified the link between smoking and lung cancer.

It is hoped the £15.5m research unit, funded by a Government Joint Infrastructure Grant, Cancer Research UK, the British Heart Foundation and Oxford University, will be completed by late 2004.

It will include research like the Million Women Study into breast cancer.