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Assoc Prof Tang Choong Leong

Assoc Prof Tang Choong Leong

MBBS (Singapore), MMed (Surg), FRCS (Ed), FAMS

Senior Consultant

Singapore General Hospital

Specialty: Surgery & Surgical Oncology, Colorectal Surgery

Clinical Interest: Colorectal Surgery, Inflammatory Bowel Disease, Pelvic Floor Disorders, Proctology, Endoscopy, Minimally Invasive Surgery – Laparoscopic Surgery

Conditions Treated by this Doctor:
Colorectal Cancer, Endoscopy, Inflammatory Bowel Disease, Minimally Invasive Surgery (MIS) Procedures in Colorectal Surgery, Pelvic Floor Disorders, Proctology Functional Bowel Disorders.

Clinical Appointments

  • Senior Consultant Colorectal Surgery Singapore General HospitalSingapore General Hospital
  • Surgical Team Inflammatory Bowel Disease Centre Singapore General HospitalSingapore General Hospital
  • Senior Consultant Division of Surgery & Surgical Oncology National Cancer Centre SingaporeNational Cancer Centre Singapore

Academic Appointments

  • NUS Yong Loo Lin School of Medicine
  • Duke-NUS Medical School


Associate Professor Tang is Senior Consultant Colorectal Surgeon, who had been practising in this field for the last 22 years. He graduated from NUS in 1987, obtained his higher degree specialist training fellowship in General Surgery in 1993 and had his overseas HMDP fellowship at the Royal Melbourne Hospital, where he had extensive training in the diagnosis, assessment and management of pelvic floor disorders and colorectal cancer. He is conversant with diagnostic and therapeutic endoscopy, laparoscopic surgery, robotic surgery and recurrent cancer surgery. He is mentor to many of the younger surgeons, who had been trained in the department.

A/Prof Tang has authored more than 100 articles and published several chapters in colorectal surgery textbooks. He continues to have a strong passion for clinical research and inspires many young colorectal surgeons to do the same. A/Prof Tang has co-organised and chaired multiple local and international training workshops and conferences over the years and has been regularly invited to speak in the field around the region. He had been Director of the Singapore Polyposis Registry, a MOH-sanctioned registry that compiles a database of genetic and hereditary colorectal cancer patients. The registry actively conducts programmes that follow up on family members, who are at high risk of developing colorectal cancers. He has recently established the Colorectal Cancer Support Group for cancer survivors. A/Prof Tang is a core faculty of the General Surgery Residency and is a member of the National Steering Committee for Colorectal Cancer Screening. He actively participates in various voluntary missions providing care and relief overseas.


  • Fellow of the Academy of Medicine of Singapore, FAMS, 1998
  • Master of Medicine, National University of Singapore, MMed (Surgery), 1993
  • Fellow of the Royal College of Surgeons of Edinburgh, FRCS(Ed), 1993
  • Bachelor of Medicine and Bachelor of Surgery, MBBS, Singapore, 1987

Professional Appointments and Committee Memberships

  • Member, Ministry of Health Steering Committee on National Colorectal Cancer Screening
  • Member, Steering Committee, SGH Ambulatory Endoscopy Centre
  • Chairman, Colorectal Cancer Recovery Programme, Singapore General Hospital
  • Chairman, SubCommittee on Database, National Colorectal Cancer Screening
  • Member, SubCommittee on Work Process, National Colorectal Cancer Screening
  • Member, Inflammatory Bowel Disease Centre, SGH
  • Medical Advisor, Ostomy Society, Singapore Cancer Society
  • Teaching and Core Faculty, ACGME programme
  • Advisor, Singapore Polyposis Registry, Department of Colorectal Surgery, Singapore General Hospital
  • Examiner, CPX2 and CPX4, Final Clinical Examinations for DukeNUS Graduate Medical School
  • Examiner, Final Professional Examination for the Degree of MBBS (Surgery Track) 
  • Examiner, Conjoint FRCS(Edinburgh) and MMed(Surgery)(NUS) General Surgery Exit Examinations in NUS
  • Past President, Singapore Society of Colorectal Surgeons. 2008-9, re-elected 2009-10
  • Member, SGH Medical Board (2015)
  • Member, SGH Service Quality Committee (2012-2016)
  • Core Faculty, SingHealth Residency Programme for Surgery


  • Fellowship, Health Manpower Development Programme (HMDP) for overseas training in Colorectal Surgery in Pelvic Floor Disorders and Colorectal Cancer Research from the Ministry of Health, Singapore. (July 1996 - June 1997).
  • SGH Excellent Publication Award, 2002. Singapore General Hospital
  • Courage Medal and Certificate of Appreciation, for Valour and Selfless Dedication in battling SARS, 2003.
  • Certificate of Appreciation – A Tribute to Our Healthcare Givers, Monetary Association of Singapore. 2003. 
  • Good Service Award for Reservist (National Service) 2003.
  • Poster entitled Survival and Long Term Outcomes of a Randomized Controlled Trial of Conventional Open versus Laparoscopic-assisted Colectomy in Colorectal Cancer Surgery presented on 28 November 2003 at the 9th Congress of the Asian Federation of Coloproctology, Seoul, Korea awarded the prize for Excellent Poster Presentation.
  • Long Service Award (10 years), Singapore General Hospital, March 2004.
  • Service Quality Award, Service with a Heart, Singapore General Hospital, May 2004.
  • National Service Award for Reservist 2005.
  • Service Quality Award, Service with a Heart, Singapore General Hospital, March 2005.
  • Service Quality Award, Service with a Heart, Singapore General Hospital, May 2006.
  • Service Quality Award, Service with a Heart, Singapore General Hospital, October 2006.
  • Service Quality Award, Heart of Gold Award, Singapore General Hospital, September – December 2006.
  • Singapore General Hospital 20-year Long Service Award, 2008
  • Service Quality Award, Service with a Heart, Singapore General Hospital, September 2008.
  • SingHealth Service Quality Award, Gold Award 2010
  • SingHealth Superstar Service Award, 2011
  • National Day Award, Ministry of Health, Long Service Award, 2015
  • SingHealth Service Award, Silver 2015, Gold 2016.
  • SingHealth Service Award, Star, 2017
  • SingHealth Excellence Award, GCEO Clinician Excellence Award 2017

Research Interests


Ileostomy Output In The Early Postoperative Period
 Choong-Leong Tang, A Yunos, Leong APK, F Seow-Cheon, Goh HS. British Journal of Surgery 1995; 82: 607

Prospective Randomised Trial of Drainage Alone Versus Drainage and Fistulotomy for Acute Perianal Abscess With Proven Internal Opening
 Choong-Leong Tang, Soo-Ping Chew and F. Seow-Choen. Diseases of the Colon and Rectum 1996; 30(12): 1415-1417

The Colorectal Cancer Recurrence Support (CARES) System
Lean-Suan Ong, Barry Shepherd, F. Seow-Choen, Yik-Hong Ho, Choong-Leong Tang, Kelvin Tan. Artificial Intelligence in Medicine 1997; 11: 175-188
A Cecal Intubation Model in the Rat That Facilitates Selective In-Vivo Study of Colonic Epithelial Biology – A Preliminary Report
 Choong-Leong Tang, Bee-Chuan Ling, Marisa Fielding, Joe J Tjandra, Peter R Gibson. Diseases of the Colon and Rectum 1998; 41(12): 1500-5

Diminutive Cancers of the Colon and Rectum: Comparison Between Flat and Polypoid Cancers
 Leong AFPK, Seow-Choen F, Choong-Leong Tang. International Journal of Colorectal Diseases 1998; 13(4): 151-153

Effect of Unilateral Sacral Nerve Stimulation on Anorectal Function
Joe J Tjandra, Choong-Leong Tang, Boon-Swee Ooi, Marcus Carey, Peter Dwyer. Journal of Pelvic Surgery 1999; 5(6): 325-329

Transanal Repair of Rectocele Corrects Obstructed Defecation If It Is Not Associated with Anismus 
 Joe J Tjandra, Boon-Swee Ooi, Choong-Leong Tang, Peter Dwyer, Marcus Carey. Diseases of the Colon and Rectum 1999; 42(12): 1544-1550

Anal Sphincter Injuries from Stapling Intruments Introduced Transanally: Randomised, Controlled Study with Endoanal Ultrasound and Anorectal Manometry
Yik-Hong Ho, Charles Tsang, Choong-Leong Tang, Denis Nyam, Kong-Weng Eu, F Seow-Choen. Diseases of the Colon and Rectum 2000; 43(2): 169–173

Post-operative Intra-Abdominal Free Gas after Open Colorectal Resection
 Choong-Leong Tang, Yeong Kuan Yuan, Denis Nyam, Eu Kong Weng, Ho Yik Hong, Adrian Leong, Charles Tsang, F Seow-Choen. Diseases of the Colon and Rectum 2000; 43(8): 1116 – 1120

Stapled Hemorrhoidectomy--Cost and Effectiveness. Randomized, Controlled Trial Including Incontinence Scoring, Anorectal Manometry, and Endoanal Ultrasound Assessments At Up To Three Months
Ho Yik Hong, Cheong Wai Kit, Tsang Charles, Ho Jean, Eu Kong Weng, Choong-Leong Tang, Seow-Choen Francis. Diseases of the Colon and Rectum 2000; 43: 1666-75

Population Screening for Colorectal Cancer – Is It The Time Now?
Choong-Leong Tang. SGH Proceedings 2001; 9(3): 207-218

Randomized Clinical Trial of Local Bupivacaine Perfusion Versus Parenteral Morphine Infusion For Pain Relief After Laparotomy
 Cheong Wai Kit, Seow-Choen Francis, Eu Kong Weng, Choong-Leong Tang, Heah Sieu Min. British Journal of Surgery 2001; 88(3): 357-9

A Prospective Randomised Study of Drains in Infra-peritoneal Rectal Anastomosis
Brown Steven R, Seow-Choen Francis, Eu Kong Weng, Heah Sieu Min, Choong-Leong Tang. Techniques in Coloproctology 2001; 5: 89-92

Systemic Immunity in Colorectal Cancer Patients after Conventional Open Colectomy and Laparoscopic-Assisted Colectomy: A Randomised Controlled Trial
 Choong-Leong Tang, Kong-Weng Eu, Bee-Choo Tai, Jade GS Soh, David Machin, F Seow-Choen. British Journal of Surgery 2001; 88(6): 801-7

Prospective Randomised Trial Comparing Ayurvedic Cutting Seton and Fistulotomy for Low Fistula-In-Ano
Ho Kok Sun, Tsang Charles, Seow-Choen Francis, Ho Yik Hong, Choong-Leong Tang, Heah Sieu Min, Eu Kong Weng. Techiques in Coloproctology 2001; 5: 137-141

Changes in In-Vivo Autofluorescence Spectra at Different Periods in Rat Colorectal Tumour Progression
 Sheng Fu, Teck-Chee Chia, Choong-Leong Tang, Cheong-Hoong Diong, F Seow-Choen. Proceedings of the International Society for Optical Engineering (SPIE) 2001; 4432: 118-123. Diagnostic Optical Spectroscopy in Biomedicine, TG Papazoglou, GA Wagnieres, eds. SPIE Press, Bellingham, WA, USA

Studies of Laser Induced Autofluorescence Intensity Ratio in Human Colorectal Cancer Diagnosis
 Sheng Fu, Teck-Chee Chia, Choong-Leong Tang, Cheong-Hoong Diong, Leong-Chuan Kwek, Seow-Choen Francis, Shanker M. Krishnan. Asian Journal of Physics, Vol. 11, No.4, 419-424, 2002

Development of a Chronic Colonic Intubation Model in Rats for the Study of Luminal Factors in Colonic Diseases
Choong-Leong Tang, S Shomik, C Wong, Joe J Tjandra, Peter R Gibson. Diseases of the Colon and Rectum. 2002; 45: 256-263

Prospective, Randomized Trial Comparing Sigmoid Versus Descending Colonic J-Pouch After Total Rectal Excision
 Heah Sieu Min, Seow-Choen Francis, Eu Kong Weng, Ho Yik Hong, Choong-Leong Tang. Diseases of the Colon and Rectum. 2002; 45(3):322-8

Comparison of J-Pouch and Coloplasty Pouch for Low Rectal Cancers: A randomized, Controlled Trial Investigating Functional Results and Comparative Anastomotic Leak Rates
 Ho Yik Hong, Brown Steven, Heah Sieu Min, Tsang Charles, Seow-Choen Francis, Eu Kong Weng, Choong-Leong Tang. Annals of Surgery. 2002; 236(1):49-55

Results of Stapling and Conventional Haemorrhoidectomy
Ooi Boon Swee, Ho Yik Hong, Choong-Leong Tang, Eu Kong Weng, Seow-Choen Francis. Tech Coloproctol 2002; 6(1):59-60; discussion 61-2

Colonic Epithelial Atrophy Induced by a Fibre-Free Diet in Rats Is Reversed by Minimal Amounts of Luminal Butyrate, But Only in the Short Term
Senguta Shomik, Choong-Leong Tang, Wong Cynthia, Tjandra J Joe, Gibson R Peter. Australian New Zealand Journal of Surgery 2002 Dec;72(12):871-6

Stapled Haemorrhoidopexy for Prolapsed Piles Performed with Concurrent Perianal Conditions. [Letter]
Ng KH, Eu KW, Ooi BS, Heah SM, Choong-Leong Tang, Seow-Choen F. Techniques in Coloproctology. 2003; 7(3): 214-5; discussion 215

Prospective Randomized Study of Bacteraemia in Diathermy and Stapled Haemorrhoidectomy
Maw A, Concepcion A, Eu Kong Weng, Seow-Choen Francis, Heah Sieu Min, Choong-Leong Tang, Tan Ai Leen. Bristish Journal of Surgery 2003; 90(2):222-6

Local Excision of Rectal Tumours – Local Experience
Tan Kok Yang, Ho Yik Hong, Seow-Choen Francis, Eu Kong Weng, Choong-Leong Tang, Heah Sieu Min. SGH Proceedings 2003; 12(1):22-6

Chemoprevention of Colorectal Cancer – Experimental Approach and Clinical Applications
Choong-Leong Tang. Annals of the Academy of Medicine, Singapore 2003; 32:169-75

A Novel Indicator for Surveillance Colonoscopy Following Colorectal Cancer Resection
Skaife Paul. Seow-Choen Francis. Eu Kong Weng. Choong-Leong Tang. Colorectal Disease 2003; 5(1):45-8

Bioresorbable Adhesion Barrier Facilitates Early Closure of the Defunctioning Ileostomy After Rectal Excision – Prospective Randomised Trial
Choong-Leong Tang, Francis Seow-Choen, Stephenie Fook-Chong, Kong-Weng Eu. Diseases of the Colon and Rectum 2003; 46(9): 1200-7
Comparison of Human Colorectal Normal Tissue with Cancerous Tissue Autofluorescence Image by Optical Sectioning with A Confocal Laser-Scanning Microscope 
 Sheng Fu, Teck-Chee Chia, Leong-Chuan Kwek, Cheong Hoong Diong, Choong-Leong Tang, Francis Seow-Choen, Shanker M Krishnan. Confocal, Multiphotons and Nonlinear Microscopic Imaging. International Society for Optical Engineering (SPIE) European Conferences on Biomedical Optics Conference Proceedings 2003; 5139:199-205

Application of Laser Induced Autofluorescence Spectra Detection in Human Colorectal Cancer Screening
Sheng Fu, Teck-Chee Chia, Leong-Chuan Kwek, Cheong Hoong Diong, Choong-Leong Tang, Francis Seow-Choen, Shanker M Krishnan. International Society for Optical Engineering (SPIE) European Conferences on Biomedical Optics Conference Proceedings 2003; 5141:298-304

Stapled Haemorrhoidectomy When Performed with Concurrent Perianal Conditions
KH Ng, KW Eu, Ooi BS, Choong-Leong Tang, SM Heah, F Seow-Choen. SGH Proceedings 2004; 13(2): 92-95

Which Colorectal Cancers Are Missed by Double Contrast Barium Enema?
Tan KY, Seow-Choen F, Ng C, Eu KW, Choong-Leong Tang, Heah SM. Techniques in Coloproctology 2004; 8(3): 169-72

Minilaparotomy Left Iliac Fossa Skin Crease Incision Versus Midline Incision for Left-Sided Colorectal Cancer
 Kam MH, Seow-Choen F, Peng XH, Eu KW, Choong-Leong Tang, Heah SM, Ooi BS. Techniques in Coloproctology 2004; 8(2): 85-8

Prospective Randomized Trial Comparing Intraoperative Colonic Irrigation with Manual Decompression for Obstructed Left-sided Colorectal Cancer
 JF Lim, Choong-Leong Tang, F Seow-Choen, SM Heah. Diseases of the Colon and Rectum 2005; 48(2): 205-9

Digital Rectal Examination Compares Favourably With Conventional Water-Soluble Contrast Enema in the Assessment Of Anastomotic Healing After Low Rectal Excision: A Cohort Study
Choong-Leong Tang, Francis Seow-Choen. International Journal of Colorectal Diseases 2005; 20(3): 262-266

High Sensitivity and Specificity of Laser-induced Autofluorescence Spectra for Detection of Colorectal Cancer with an Artificial Neural Network
 Sheng Fu, Teck-Chee Chia, Leong-Chuan Kwek, Cheong Hoong Diong, Choong-Leong Tang, Shanker M Krishnan. Applied Optics 2005; 44(19): 4004-8

False Positive FDG PET-CT Scans from Suture Granuloma and Chronic Inflammation: Report of Two Cases and Review of Literature
Jason Wei-Min, Lim, Choong-Leong, Tang, Gilbert Han Weng, Keng. Annals, Academy of Medicine, Singapore, 2005; 34: 457-60

Application of Laser-induced Autofluorescence Spectra Detection System in Human Colorectal Cancer In-Vivo Screening
Teck-Chee Chia, Sheng Fu, Y. H. Chia, Leong-Chuan Kwek, Choong-Leong Tang. Photonic Application in Biosensing and Imaging. SPIE, 2005;5969:332-342

Detection of Colorectal Cancer Using Time-Resolved Autofluorescence Spectrometer
S Fu L. C. Kwek, T. C. Chia, C. S. Lim, Choong-Leong Tang. Biophotonics and New Therapy Frontiers, SPIE, 2006;6191:163-172
Meta-analysis of Randomized Clinical Trials Comparing Drainage Alone versus Primary Sphincter-cutting Procedures for Anorectal Abscess-Fistula
Hak-Mien Quah, Choong-Leong Tang, Kong-Weng Eu, Miny Samuel, Edwin S.Y. Chan. International Journal of Colorectal Diseases 2006; 21(6): 602-9. DOI 10.1007/s00384-005-0060-y

Randomized Controlled Trial of 0.5% Ferric Hyaluronate Gel (Intergel) in the Prevention of Adhesions Following Abdominal Surgery
Choong-Leong Tang, David G Jayne, Francis Seow-Choen, Kong-Weng Eu, Yen-Yee Ng, Noriza Mustapa. Annals of Surgery 2006; 243(4): 449-55

PPH-03 Stapled Haemorrhoidopexy: Our Experience 
Lim YK, Eu KW, Ho KS, Ooi BS, Choong-Leong Tang. Techniques in Coloproctology 2006; 10(1): 43-6

Cutaneous and Subcutaneous Metastases of Adenocarcinoma of the Colon and Rectum
 Tan Kok Yang, Ho Kok Sun, Lai Jiunn Herng, Lim Jit Fong, Ooi Boon Swee, Choong-Leong Tang, Eu Kong Weng. Annals of the Academy of Medicine, Singapore. 2006; 35(8): 585-7

Experience of 3711 Stapled Haemorrhoidectomy Operations
 KH Ng, KS Ho, BS Ooi, Choong-Leong Tang, EW Eu. British Journal of Surgery 2006; 93: 226-230

A Systematic Review of the Function and Complications of Colonic Pouches
 Poh-Koon Koh, Choong-Leong Tang, Kong-Weng Eu, Miny Samuel, Edwin Chan. International Journal of Colorectal Diseases 2007; 22(5):543-8, 2007. DOI 10.1007/s00384-006-0187-5

A Six-Year Review of Surgical Morbidity and Oncological Outcome after High Anterior Resection for Colorectal Malignancy without Splenic Flexure Mobilization
 Katory Mark, Choong-Leong Tang, Koh WL, Fook-Chong SM, Loi TT, Ooi Boon Swee, Ho Kok Sun, Eu Kong Weng. Colorectal Disease. 2008 Feb; 10(2):165-9

Mesenteric Desmoid Tumours in Singapore Familial Adenomatous Polyposis Patients: Clinical Course and Genetic Profile in A Predominantly Chinese Population
Koh PK. Loi C. Cao X. Cheah PY. Ho KS. Ooi BS. Choong-Leong Tang. Eu KW. Dis Colon Rectum. 2007; 50:75-82

Phenotypic Characteristics of Hereditary Non-Polyposis Colorectal Cancer by the Amsterdam Criteria: An Asian Perspective
 Chew MH, Koh PK, Ng KH, Lim JF, Ho KS, Ooi BS, Choong-Leong Tang, Eu KW. ANZ J Surg. 2008 Jul;78(7):556-60

Laparoscopic Versus Open Right Hemicolectomy: A Comparison of Short-Term Outcomes
Tan WS, Chew MH, Ooi BS, Ng KH, Lim JF, Ho KS, Choong-Leong Tang, Eu KW. Int J Colorectal Dis. 2009 Nov;24(11):1333-9. Epub 2009 Jun 2

Meta-Analysis of Defunctioning Stomas in Low Anterior Resection for Rectal Cancer
 Tan WS, Choong-Leong Tang, Shi L, Eu KW. Br J Surg. 2009 May;96(5):462-72. Review

Colorectal Cancer Mass Screening Event Utilising Quantitative Faecal Occult Blood Test
Chew MH, Suzanah N, Ho KS, Lim JF, Ooi BS, Choong-Leong Tang, Eu KW. Singapore Med J. 2009 Apr;50(4):348-53

Systematic Review of Intraoperative Colonic Irrigation Versus Manual Decompression in Obstructed Left-Sided Colorectal Emergencies. [Review] 
Kam MH, Choong-Leong Tang, Chan E, Lim JF, Eu KW. Int J Colorectal Dis. 24(9):1031-7, 2009 Sep

Peutz-Jeghers Syndrome: Data from the Singapore Polyposis Registry and A Shifting Paradigm in Management
Tan Veronique KM, Koh Poh Koon, Loi, Carol TT, Eu Kong Weng, Choong-Leong Tang. Annals of the Academy of Medicine, Singapore. 39(1):17-21, 2010 Jan

Radiation Proctitis: A Decade's Experience
 Wong MTC, Lim JF, Ho KS, Ooi BS, Choong-Leong Tang, Eu KW. Singapore Med J. 51(4):315-9, 2010 Apr

Stapled Anastomosis for Anterior Resection is Safe Even After Previous Stapled Haemorrhoidectomy – A Report of Five Cases
Fu Wan-Pei, Quah Hak-Mien, Choong-Leong Tang, Ooi Boon-Swee, Eu Kong-Weng. International Journal of Colorectal Disease. 25(12):1503-6, 2010 Dec. Epub 2010 June 25

Twenty Years of Familial Adenomatosis Polyposis Syndromes in the Singapore Polyposis Registry: An Analysis of Outcomes
Chew MH, Quah HM, Teh KL, Loi TT C, Eu KW, Choong-Leong Tang. Singapore Med J 2011; 52(4): 246-251

Laparoscopic resection for colorectal polyps: a single institution experience
Lai JH. Ng KH. Ooi BS. Ho KS. Lim JF. Choong-Leong Tang. Eu KW. ANZ Journal of Surgery. 81(4):275-80, 2011 Apr

Results of 7302 Stapled Haemorrhoidectomy Operations in A Single Centre: A Seven-Year Review and Follow-Up Questionnaire Survey
Kam Ming-Hian, Ng Kheng-Hong, Lim Jit-Fong, Ho Kok-Sun, Ooi Boon-Swee, Choong-Leong Tang, Eu Kong-Weng. ANZ Journal of Surgery. 81(4):253-6, 2011 Apr

Evaluation of Current Devices in Single-Incision Laparoscopic Colorectal Surgery: A Preliminary Experience in 32 Consecutive Cases: Reply
Chew Min Hoe, Wong Mark Te-Ching, Lim Yon-Kuei, Ng Kheng-Hong, Eu Kong-Weng, Choong-Leong Tang. World Journal of Surgery. 35(11):2580-1, 2011 Nov

Endoscopic Stenting and Elective Surgery Versus Emergency Surgery for Left-Sided Malignant Colonic Obstruction: A Prospective Randomized Trial
Ho KS, Quah HM, Lim JF, Choong-Leong Tang, Eu KW. Int J Colorectal Dis. 2012 Mar;27(3):355-62. Epub 2011 Oct 28. International Journal of Colorectal Disease. 27(3):355-62, 2012 Mar

Stage IV Colorectal Cancers: An Analysis of Factors Predicting Outcome and Survival in 728 Cases
Chew MH, Teo JY, Kabir T, Koh PK, Eu KW, Choong-Leong Tang. J Gastrointest Surg. 2012 Mar;16(3):603-12. Epub 2011 Oct 19. Journal of Gastrointestinal Surgery. 16(3):603-12, 2012 Mar

Reversal of Hartmann's Procedure: Experience in An Asian Population
Tan WS, Lim JF, Choong-Leong Tang, Eu KW. Singapore Med J. 2012 Jan;53(1):46-51

Association of Caucasian-Identified Variants with Colorectal Cancer Risk in Singapore Chinese
Lai Fun Thean, Hui Hua Li, Yik Ying Teo, Woon-Puay Koh, Jian-Min Yuan, Mei Lin Teoh, Poh
 Koon Koh, Choong-Leong Tang, Peh Yean Cheah. PLoS one eISSN-1932-6203,

Evaluation of Laparoscopic Versus Open Colorectal Surgery in Elderly Patients More Than 70 Years Old: An Evaluation of 727 Patients
Tan Wah Siew, Chew Ming Hoe, Irene Ai Ling, Choong-Leong Tang, Ng Kheng Hong, Eu Kong Weng. Int J Colorectal Dis. 27(6):773-80, 2012 Jun

Biofeedback is An Effective Treatment for Patients With Dyssynergic Defaecation
Dennis Koh, Lim Jit Fong, Quah Hak Mein, Choong-Leong Tang. Singapore Med J. 53(6):381-4, 2012

Conventional Laparoscopic Versus Single-Incision Laparoscopic Right Hemicolectomy: A Case Cohort Comparison of Short-Term Outcomes in 144 Consecutive Cases
Chew MH, Chang MH, Tan WS, Wong MT, Choong-Leong Tang. Surg Endosc. 2013 Feb;27(2):471-7. doi: 10.1007/s00464-012-2460-8. Epub 2012 Jul 18

Close Distal Margins Do Not Increase Rectal Cancer Recurrence After Sphincter-Saving Surgery Without Neoadjuvant Therapy
Lim JW, Chew MH, Lim KH, Choong-Leong Tang. Int J Colorectal Dis. 2012 Oct;27(10):1285-94. Epub 2012 Aug 24

The Classification of Intestinal Polyposis
Cheah PY, Lim KH, Koh PK, Choong-Leong Tang. Nat Genet. 2013 Jan;45(1):2. doi: 10.1038/ng.2474

Opportunistic Screening for Colorectal Neoplasia in Singapore Using Faecal Immunochemical Occult Blood Test
Tan WS, Choong-Leong Tang, Koo WH. Singapore Med J. 2013 Apr;54(4):220-3

Young Colorectal Carcinoma Patients Do Not Have A Poorer Prognosis: A Comparative Review of 2,426 Cases
Yeo SA, Chew MH, Koh PK, Choong-Leong Tang. Tech Coloproctol. 2013 Mar 5. [Epub ahead of print]

Serum Methylation Levels of TAC1. SEPT9 and EYA4 as Diagnostic Markers for Early Colorectal Cancers: A Pilot Study
 Liu Y, Tham CK, Ong SY, Ho KS, Lim JF, Chew MH, Lim CK, Zhao Y, Choong-Leong Tang, Eu KW. Biomarkers. 2013 Aug;18(5):399-405. doi: 10.3109/1354750X.2013.798745

Mismatch Repair Deficiency Screening via Immunohistochemical Staining in Young Asians with Colorectal Cancers
 Chew MH, Koh PK, Tan M, Lim KH, Carol L, Choong-Leong Tang. World J Surg. 2013 Oct;37(10):2468-75. doi: 10.1007/s00268-013-2134-2
A Novel Indel in Exon 9 of APC Upregulates A 'Skip Exon 9' Isoform and Causes Very Severe Familial Adenomatous Polyposis
 Cheah PY, Wong YH, Koh PK, Loi C, Chew MH, Choong-Leong Tang. Eur J Hum Genet. 2013 Oct 30. doi: 10.1038/ejhg.2013.245. [Epub ahead of print]

Risk Prediction Score in Laparoscopic Colorectal Surgery Training: Experience from the English National Training Programme
 Mackenzie H, Miskovic D, Ni M, Tan WS, Keller DS, Tang CL, Delaney CP, Coleman MG, Hanna GB. Ann Surg. 2014 Mar 18. [Epub ahead of print]

Systematic Study on Genetic and Epimutational Profile of A Cohort of Amsterdam Criteria-Defined Lynch Syndrome in Singapore
 Liu Y, Chew MH, Goh XW, Tan SY, Loi CT, Tan YM, Law HY, Koh PK, Tang CL. PLoS One. 2014 Apr 7;9(4):e94170. doi: 10.1371/journal.pone.0094170. eCollection 2014

Evolution of Laparoscopy in Colorectal Surgery: An Evidence-Based Review
 Blackmore AE, Wong MT, Tang CL. World J Gastroenterol. 2014 May 7;20(17):4926-4933. Review

Research Trials