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Dr Leong Yiat Horng

  • Consultant, Department of Radiation Oncology, National University Cancer Institute, Singapore
B.Eng (Singapore), MBBS (Australia), FRANZCR (Radiation Oncology), Masters of Clinical Investigation (Singapore))
Radiation Oncology
Special Interests:
Head & Neck cancer, Gynaecological Cancer, Breast Cancer, Brachytherapy, Proton Therapy 


Dr Leong Yiat Horng is a Consultant at the National University Cancer Institute, Singapore (NCIS).  After obtaining his Bachelor of Engineering in 2000, he pursued medical training in Sydney, Australia and graduated from the University of Sydney (MBBS) in 2005. Integrating his knowledge in both engineering and medicine, he underwent specialist training in Radiation Oncology at NCIS. He was admitted as a Fellow of the Royal Australian and New Zealand College of Radiologists and obtained specialist accreditation in Singapore in 2015. He has vast clinical experience in both Singapore and Western Australia.

Dr Leong’s specialty and research interests are in head and neck, gynaecological and breast cancers. He is the Lead of the gynaecologic subspecialty in the department. Dr Leong also leads the departmental brachytherapy service which offers internal radiation therapy to several cancer subsites. He has a keen interest in proton therapy for head and neck cancers. He is actively involved in clinical research and has published his work on head and neck cancers and pelvic cancers, where he is the principal investigator for a number of clinical trials.  

Dr Leong is actively engaged in the education of radiotherapy diploma students and undergraduate medical students and is a Clinical Mentor at the NUS Yong Loo Lin School of Medicine.

Journals & Publications

1. Yiat Horng Leong, Jeremy Tey et al. Oncologic outcomes of neoadjuvant chemoradiation for locally advanced rectal cancer: a single-institution experience. Annals Academy of Medicine Singapore 2014.

2. Yiat Horng Leong, Eli Scher, Nancy Lee, Ivan Tham. Major Salivary Glands. Target volume delineation for conformal and intensity-modulated radiation therapy. Springer 2015.    

3. Yiat Horng Leong, YY Soon, F Ho. Long-term Outcomes After Reirradiation in Nasopharyngeal Carcinoma with Intensity-modulated Radiotherapy: a Meta-analysis of Clinical Evidence. Head and Neck 2017.

4. Yiat Horng Leong, K Tan, BA Choo et al. Novel anesthetic technique for combined intracavitary and interstitial brachytherapy for cervix cancer in an outpatient setting. Journal of Contemporary Brachytherapy 2017.

5. 4. F Kazmi, YY Soon, Yiat Horng Leong et al. Re-irradiation for recurrent glioblastoma: a systematic review and meta-analysis. Journal of Neuro-oncology 2019.

6. M Tseng, F Ho, Yiat Horng Leong et al. Emerging radiotherapy technologies and trends in nasopharyngeal cancer. Cancer Communications 2020.

7. TH Tan, YY Soon, T Cheo, L Wong, Yiat Horng Leong et al. Applying the ASCO and European Society for Medical Oncology value frameworks to nasopharyngeal cancer treatments: is adding induction chemotherapy to concurrent chemoradiotherapy worthwhile? JCO Oncology Practice 2020.