Dr Tan Chee Seng is a Senior Medical Oncologist at OncoCare Cancer Centre. Prior to this he was a Consultant with the Haematology-Oncology Department of National University Cancer Institute of Singapore (NCIS), National University Hospital (NUH) and Visiting Consultant at Ng Teng Fong General Hospital (NTFGH).

He obtained his undergraduate medical degree from School of Medicine, National University of Singapore and his post-graduate qualification from Royal College of Physicians, United Kingdom. He completed his advanced specialist training in Medical Oncology from National University Hospital. He was later awarded with the prestigious Academic Medicine Development Award (AMDA) fellowship to subspecialize in personalization of lung cancer therapies at Addenbrooke’s Hospital, Cambridge University, United Kingdom.

His main clinical interests are in lung/thoracic and head/neck cancers. He was principal investigator or co-investigators for several international multi-center cancer clinical trials including novel chemotherapy agents, targeted therapies, tyrosine kinase inhibitors, antibody-drug conjugates, immunotherapy agents and etc. Dr Tan has also authored or co-authored publications in peer-reviewed international journals including Lancet Oncology, Clinical Cancer Research, Molecular Cancer, Lung Cancer, Oncotarget, Target Oncology, Journal of Cancer Research and Clinical Oncology, Journal of Translational Medicine, Journal of Oncology Practice and etc.

He had been invited to speak or to chair in local and regional oncology meetings. He also routinely held public talks and to local GP to inform them of the latest innovative treatments for cancers. Dr Tan was also the recipient of several grants including National Medical Research Council (NMRC) Clinician Investigator Salary Support Programme and Investigational Medicine Unit (IMU) Bridging Funds.

He is a member of several professional bodies including American Society of Clinical Oncology (ASCO), European Society of Medical Oncology (ESMO), International Association for the Study of Lung Cancer (IASLC) and was an executive committee member of the Singapore Society of Oncology.

He was actively involved in both undergraduate and post graduate teachings at the Yong Loo Lin School of Medicine (YLLSOM) and National University Hospital (NUH) respectively. He was previously appointed as the Assistant Professor for Faculty of Medicine, YLLSOM and Undergraduate Education Director (Medical Oncology). He was also a core faculty member of Medical Oncology Senior Residency of NUH. He was invited to be examiner for YLLSOM final year MBBS examinations.

​Dr Tan is fluent in English, Mandarin and Malay/Bahasa. He is able to speak some Cantonese and Hokkien. He has taken care of patients from many regional and overseas regions including Malaysia, Indonesia, Vietnam, Myanmar, China, Bangladesh, Sri Lanka and India.