Dr Edward Sun graduated from the University of Sydney in 1982. He was awarded the NSW State Cancer Council Training Fellowship in radiation oncology in 1984 and undertook specialty training in radiation oncology at Westmead Hospital and the Prince of Wales Hospital between 1984 and 1987. In 1984 he won the C.E. Eddy Prize for being the most successful candidate in D.R.A.C.R. Part 1 examination.

After completing his fellowship, Dr Sun was a senior registrar in radiation oncology at Prince of Wales Hospital, Randwick in 1988 and a locum staff specialist at St. Vincent’s Hospital, Darlinghurst in 1989. From 1990 to 1991, Dr Sun was appointed Medical and Health Officer at the Institute of Radiotherapy, Queen Mary Hospital, Hong Kong, gaining experience in head and neck, gynaecological cancers and brachytherapy techniques. In 1992 Dr Sun returned to join the Sydney Radiotherapy and Oncology practice and is currently consulting at the Sydney Adventist Hospital, Hornsby Ku-ring-gai District Hospital and Gosford Private Hospital.

Dr Sun is also a clinical teacher with the University of Sydney and the University of Newcastle. Dr Sun has particular interest in urological cancer, lung cancer and head and neck cancers, stereotactic body radiation therapy  and brachytherapy treatments of various malignancies including prostate and gynaecological cancers.