Dr Ang was awarded Singapore President’s scholarship in 1977. He was awarded the Prof Sir Gordon Arthur Ransome Gold medal for being the top candidate in the Master of Medicine Clinical Examinations in 1986, and Singapore’s National Science Award in 1996 for his outstanding contributions in Medical Research. In recognition of his public service, the Sultan of Kedah conferred upon him a datukship in 2003. Dr Ang was founding Head of the Department of Medical Oncology at Singapore General Hospital from 1991 to 1997. He held the concurrent post of Director of the Oncology Centre and Clinical Associate Professor at the Faculty of Medicine, NUS. He is a council member of Singapore Cancer Society.

He was past President of Singapore Society of Oncology. He maintains a keen interest in research and has published and presented more than 100 papers and abstracts.