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Clin Asst Prof Ong Sin Jen

Clin Asst Prof Ong Sin Jen

MBBS, MMed (Int Med), MRCP

Senior Consultant

National Cancer Centre Singapore

Specialty: Medical Oncology

Clinical Interest: Colorectal, Hepato-Pancreato-Biliary, Upper Gastrointestinal, Neuro-Oncology

Conditions Treated by this Doctor:
Brain cancer, Colorectal Cancer, Hepato-Pancreato-Biliary Cancers, Oesophagus Cancer, Pancreatic Cancer, Stomach Cancer.

Clinical Appointments

  • Senior Consultant Division of Medical Oncology National Cancer Centre SingaporeNational Cancer Centre Singapore
  • Visiting Consultant NCCS Oncology Clinic @ CGH Changi General HospitalChangi General Hospital

Academic Appointments

  • Clinical Asst Professor at Duke-NUS Medical School


Dr Ong Sin Jen is a consultant working at the Division of Medical Oncology at the National Cancer Centre Singapore and Visiting Consultant at Changi General Hospital. He obtained his undergraduate medical degree from Guy’s, King’s and St Thomas’ School of Medicine (formerly United Medical and Dental School of Guy’s and St Thomas’ Hospitals), London, and completed his postgraduate specialist training in Medical Oncology at the National Cancer Centre Singapore. 

His clinical interests include gastrointestinal and hepatobiliary malignancies, and neuro-oncology. He is also a Clinical Lecturer at Yong Loo Lin School of Medicine.


  • MRCP, Royal College of Physicians 
  • MMed (Int Med), National University of Singapore 
  • MBBS, Guy’s, King’s & St Thomas’ School of Medicine

Professional Appointments and Committee Memberships

  • Member, Singapore Society of Oncology 
  • Member, Royal College of Physicians (UK)


  • Singapore Health Quality Service Award (silver), 2011 
  • Best Service (Medical Officer) Award, 2008

Research Interests


  • Wang J, Wang X, Zhao M, Choo SP, Ong SJ, Ong SY, Chong SS, Teo YY, Lee CG. Potentially functional SNPs (pfSNPs) as novel genomic predictors of 5-FU response in metastatic colorectal cancer patients. PLoS One. 2014 Nov 5;9(11):e111694. 
  • Poon E, Ong SJ, Chuang XE, Lim WT, Mohd Zam NA, Chong TW, Al Jajeh I, Mancer K, Tan MH. 'Prechronous' metastasis in clear cell renal cell carcinoma: a case report. J Med Case Rep. 2011 May 13;5:181.
  • Ong SJ, Teo M, Lim KH, Choo SP, Toh HC. Rapamycin and thalidomide treatment of a patient with refractory metastatic gastroesophageal adenocarcinoma: a case report. The Oncologist. 2010;15(9):965-968. 
  • Anantham D, Ong SJ, Chuah KL, Fook-Chong S, Hsu A, Eng P. Sarcoidosis in Singapore: epidemiology, clinical presentation and ethnic differences. Respirology. 2007 May;12(3):355-360.

Research Trials