Dr Tham Weng Keong Ivan

Dr Ivan Tham is a radiation oncologist at Mount Elizabeth Hospitals and Gleneagles Hospital, Singapore.

He has special interests in brain tumours, head and neck cancers, lung cancers, and general radiation oncology. He also has experience with a variety of treatment techniques including stereotactic radiosurgery, stereotactic body radiotherapy, image-guided radiotherapy, intensity modulated radiotherapy, 3D conformal radiotherapy, and brachytherapy.

He was formerly the head of the radiation oncology departments and was a senior consultant at the National University Hospital (NUH) and Tan Tock Seng Hospital.

Dr Tham graduated from the National University of Singapore (NUS). He completed his fellowship of the Royal Australian and New Zealand College of Radiologists, and received the certification of full medical and specialist registration (radiation oncology). He is also a recognised specialist in radiation oncology in the Australian Medical Council and Australian Health Practitioner Regulation Agency.

He received training in clinical and radiation oncology at the National Cancer Centre Singapore and Guy’s & St Thomas’ NHS Foundation Trust, UK. In 2022, he underwent a 1-month training attachment at The Roberts Proton Therapy Center, Perelman Center for Advanced Medicine, Penn Medicine, USA to learn advanced techniques in proton beam therapy. He has been practising medicine for more than 20 years.

Dr Tham previously served on the residency advisory committee (radiation oncology), which selects and supervises the training of junior doctors in radiation oncology.

He was on the Ministry of Health (MOH)’s national advisory committee and the cancer subcommittee. He was vice-president of The Federation of Asian Organizations for Radiation Oncology in 2017 - 2018. He currently serves on the MOH proton beam therapy advisory committee.

Besides clinical work, Dr Tham has an interest in research. While at NUH, he was an associate professor of medicine at NUS, and co-authored more than 128 peer-reviewed publications or presentations on oncology or imaging. His work has been cited by other scientists more than 2,800 times. He has also been involved in teaching locally and overseas, and given lectures in Singapore, Malaysia, Indonesia, Taiwan, Vietnam and Japan. He has also contributed to several textbook chapters in oncology.