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Prof Thomas Loh Kwok Seng

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  • Senior Consultant, Department of Otolaryngology - Head & Neck Surgery (ENT), National University Hospital
  • Professor, Department of Otolaryngology, Yong Loo Lin School of Medicine, National University of Singapore
  • Group Chairman, Medical Board, National University Health System


MBBS(S'pore), FRCS(Glasg)


Otorhinolaryngology / Ear, Nose, Throat (ENT) Surgery

Clinical Disciplines/Programmes:

Head & Neck Surgery

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Dr Loh graduated from the Faculty of Medicine, National University of Singapore. He underwent residency in Otolaryngology at the National University Hospital and subsequently trained in Head and Neck Cancer Surgery at the Princess Margaret Hospital and Toronto General Hospital in Canada. He is currently a Senior Consultant at the Department of Otolaryngology - Head & Neck Surgery. His practice is in Head and Neck Oncology. Dr Loh is also the Leader of Head & Neck Tumour Group at the National University Cancer Institute of Singapore.

His practice is mainly in patients with cancers of the oral cavity, pharynx, larynx, thyroid and other sites, and head and neck tumours. The majority of Dr Loh’s cancer patients have nasopharyngeal carcinoma (NPC), the most common head and neck cancer in Singapore.

He leads the Head and Neck Tumour Board, where radiation and medical oncologists, together with surgical oncologists, decide on the stage and the treatment for the cancer patients. He performs surgery of the thyroid gland and parotid salivary gland and other major complicated surgery to treat cancers of the oral cavity, pharynx and larynx. Where it is suitable, he also treats cancer of the larynx using laser surgery. Dr Loh also performs complicated tumours of the anterior skull base, or tumours at the junction just below the brain.

Dr Loh also mentors a constant stream of elective students from overseas ranging from Australia to England, Netherlands and Germany, just to name a few. He is also a member of the Residents Advisory Committee that oversees the Otolaryngology specialty in Singapore. He was awarded the Yong Loo Lin School of Medicine Faculty Teaching Excellence Award and the NUS University Teaching Excellence Award in 2006 in recognition of his contribution to medical undergraduate teaching in NUS. He has also been awarded post graduate teaching excellence awards in 2011, 2012 and 2015.

Besides teaching and caring for patients, Dr Loh is also active in research. His main research is in the area of early diagnosis on Nasopharyngeal Carcinoma (NPC) and is focused on a screening programme for first-degree relatives of NPC patients. Dr Loh’s research is widely published with the majority centered on NPC.


  • 2020 - Special Recognition Award
  • 2019 - ENT Poster Presentation Winners - 2nd (18th Asean ORL-HNS Congress 2019)
  • 2017 - Special Recognition Award (SRA)
  • 2016 - NUH Teaching Excellence Award 2016

Journals & Publications

  1. Tay JK, Lim WS, Loh WS, Loh KS.  Sustaining Otolaryngology Services for the Long Haul during the COVID-19 Pandemic: Experience from a Tertiary Health System.Otolaryngol Head Neck Surg. 2020 Jul;163(1):47-50. doi: 10.1177/0194599820922983. Epub 2020 May 5.
  2. Tay JK, Khoo ML, Loh WS.  Surgical Considerations for Tracheostomy During the COVID-19 Pandemic: Lessons Learned From the Severe Acute Respiratory Syndrome Outbreak.  JAMA Otolaryngol Head Neck Surg. 2020 Jun 1;146(6):517-518. doi: 10.1001/jamaoto.2020.0764.
  3. Chong WQ, Lim CM, Sinha AK, Tan CS, Chan GHJ, Huang Y, Kumarakulasinghe NB, Sundar R, Jeyasekharan AD, Loh WS, Tay JK, Yadav K, Wang L, Wong AL, Kong LR, Soo RA, Lau JA, Soon YY, Goh RM, Ho FCH, Chong SM, Lee SC, Loh KS, Tai BC, Lim YC, Goh BC.  Integration of Antiangiogenic Therapy with Cisplatin and Gemcitabine Chemotherapy in Patients with Nasopharyngeal Carcinoma. Clin Cancer Res. 2020 Oct 15;26(20):5320-5328. doi: 10.1158/1078-0432.CCR-20-1727. Epub 2020 Aug 14.
  4. Tay JK, Khoo ML, Loh WS.  Tracheostomy During COVID-19 Pandemic-In Search of Lost Timing-Reply.  JAMA Otolaryngol Head Neck Surg. 2020 Sep 3. doi: 10.1001/jamaoto.2020.2633
  5. Chee J, Lin X, Lim WS, Loh WS, Thong M, Ng L.  Using 3D-printed nose models in nasopharyngeal swab training.  Oral Oncol. 2021 Feb;113:105033. doi: 10.1016/j.oraloncology.2020.105033. Epub 2020 Oct 9.
  6. Bier-Laning C, Cramer JD, Roy S, Palmieri PA, Amin A, Añon JM, Bonilla-Asalde CA, Bradley PJ, Chaturvedi P, Cognetti DM, Dias F, Di Stadio A, Fagan JJ, Feller-Kopman DJ, Hao SP, Kim KH, Koivunen P, Loh WS, Mansour J, Naunheim MR, Schultz MJ, Shang Y, Sirjani DB, St John MA, Tay JK, Vergez S, Weinreich HM, Wong EWY, Zenk J, Rassekh CH, Brenner MJ.  Tracheostomy During the COVID-19 Pandemic: Comparison of International Perioperative Care Protocols and Practices in 26 Countries.  Otolaryngol Head Neck Surg. 2020 Nov 3:194599820961985. doi: 10.1177/0194599820961985
  7. Wu B, Tay JKX, Loh WS, Petersson F.  Epithelioid Sarcoma of the External Auditory Canal: An Uncommon Tumor at an Unusual Site and a Brief Overview of the Literature. Head Neck Pathol. 2021 Jan 4. doi: 10.1007/s12105-020-01275-4.
  8. Tay JK, Cross GB, Sun L, Chia A, Chee J, Loh J, Lim ZY, Ngiam N, Khang WP, Yeap S, Goh HL, Siow CH, Loh WS, Loh KS, Lee CK, Yan B, Chow VTK, Wang Y, Boey F, Wong JEL, Allen DM.  Clinical Diagnostic Study of a Novel Injection Molded Swab for SARS-Cov-2 Testing. Infect Dis Ther. 2021 Jan 11:1-8. doi: 10.1007/s40121-020-00391-6.
  9. Meyappan M, Loh WS, Tan LY, Tan SFI, Ho PY, Poh YJ, Tan NC.  Development of a novel gout treatment patient decision aid by patient and physician: A qualitative research study. Health Expect. 2021 Jan 12. doi: 10.1111/hex.13184.
  10. Tay JK, Cross GB, Toh ST, Lee CK, Loh J, Lim ZY, Ngiam N, Chee J, Gan SW, Saraf A, Chow WTE, Goh HL, Siow CH, Lian DWQ, Loh WS, Loh KS, Lim CM, Chua YY, Tan TT, Tan HK, Yan B, Ko K, Chan KS, Oon L, Chow VTK, Wang Y, Fuh JYH, Yen CC, Wong JEL, Allen DM.  Design and Multicenter Clinical Validation of a 3-Dimensionally Printed Nasopharyngeal Swab for SARS-CoV-2 Testing. JAMA Otolaryngol Head Neck Surg. 2021 Feb 18:e205680. doi: 10.1001/jamaoto.2020

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