Our Specialists

Colon Surgeon in Singapore

Singapore Female Surgeon

Dr Tan Wah Siew

Senior Consultant Colorectal Surgeon

MBBS, MMed (Surgery), FAMS, FRCSEd

Dr Tan Wah Siew was senior consultant surgeon at the Department of Colorectal Surgery, Singapore General Hospital (SGH) prior to her move to private practice. She was the first female consultant colorectal surgeon in the history of SGH, and was one of the earliest female general surgeons in Singapore to be trained in robotic colorectal surgery.

She graduated from the Faculty of Medicine, National University of Singapore in 2003 and completed her Advanced Surgical Training in General and Colorectal Surgery at SGH in 2011. In 2013, she completed a one year Ministry of Health sponsored Healthcare Manpower Development Plan Fellowship (HMDP) at St. James University Hospital in Leeds, United Kingdom. While there, she trained in minimally invasive and robotic colorectal surgery for colorectal cancer, surgery for inflammatory bowel disease as well as treatment of locally advanced rectal cancers and recurrent pelvic cancers requiring removal of multiple organs and/or pelvic exenterations.

Female General Surgeon

In Minimally Invasive and Robotic Colorectal Surgery

From screening colonoscopies to major surgeries to remove cancer, Dr Tan’s passion is in melding the intricate art of surgery, with the sacred profession of being a cancer surgeon. A certified console surgeon of the da Vinci® robotic surgical system, her subspecialty interests are in robotic and minimally invasive colorectal surgery, particularly in the treatment of advanced and recurrent colon and rectal cancers. During her tenure at SGH, she performed numerous minimally invasive lateral pelvic lymph node dissections for patients with advanced rectal cancer, as well as complete mesocolic excision surgery for colon cancer. She was also part of a multi-disciplinary team who performed the first (in SGH) robotic pelvic exenteration for a patient with advanced rectal cancer.

To date, she has performed more than 500 major colorectal resection surgeries for both colorectal cancer and benign colorectal conditions. In addition, since 2016, she has been part of the multi-disciplinary Inflammatory Bowel Disease (IBD) Team at SGH. As one of the IBD surgeons in the team, she has performed many life-saving surgeries for patients with both ulcerative colitis and crohn’s disease.

& Research Involvement

Our colorectal surgeon has published widely in multiple peer-reviewed journals, particularly on minimally invasive colorectal surgery. She has been a reviewer for numerous local and international journals, including the Singapore Medical Journal, British Journal of Surgery, Colorectal Disease and International Journal of Colorectal Disease. She has been a member of the Society of Colorectal Surgeons, Singapore (SCRS) since 2011, and was a member of its executive committee from 2014 to 2015. She is also a member of the Robotic Surgery Society of Singapore and the Association of Women Doctors (Singapore).

Medical Students, Surgical Residents & Nurses

Throughout her career, she has always been actively involved in the teaching of medical students, surgical residents and nurses. During her tenure at SGH, she was clinical senior lecturer at Yong Loo Lin School of Medicine, NUS as well as Adjunct Assistant Professor at Duke-NUS Medical School. She has conducted laparoscopic and endoscopic skills training courses both for international delegates as well as for surgical residents, and has also been involved in the teaching of nurses at Nanyang Polytechnic.

  • National University of Singapore, M.B.B.S
  • Royal College of Surgeons of Edinburgh, MRCS
  • National University of Singapore, Master of Medicine (Surgery),
  • Royal College of Surgeons of Edinburgh, FRCS
  • Singhealth- SMU Graduate Diploma in Healthcare Leadership and Management

  • Basic and Advanced Surgical Training in General Surgery
    • Singapore General Hospital
  • Minimally Invasive and Robotic Colorectal Surgery
    • St James University Hospital, Leeds, United Kingdom

  • Adjunct Assistant Professor, Duke-NUS Medical School
  • Clinical Senior Lecturer, Yong Loo Lin School of Medicine, NUS
  • Member of Society of Colorectal Surgeons (Singapore)
  • Executive committee member, 10th International Society of Laparoscopic Colorectal Surgery Con-gress 2015
  • Member of Robotic Surgery Society of Singapore

  • NUS Medical Society Excellence Award for Sports 1999
  • Singapore General Hospital Annual Scientific Meeting 2008 (Annual EBM Seminar): 1st prize for Best EBM (Surgery)
  • Singapore General Hospital Service Quality Award 2008
  • Singhealth Best Registrar Award 2008 and 2009
  • European Society of Coloproctology 5th Scientific and Annual General Meeting 2010: Lunchtime poster award (2nd prize)
  • Singapore General Hospital Annual Scientific Meeting 2011: Best Oral Paper (2nd prize)
  • Singapore Health Quality Service Award: Silver (2011)
  • Singapore Health Quality Service Award: Gold (2012)
  • SingHealth Health Manpower Development Plan Fellowship Award (HMDP) 2012
  • 10 year Long Service Award, Singhealth (2014)
  • Service With a Heart Award, Singhealth (2017)
  • Singapore Health Quality Service Award: Silver (2020)
“Colorectal cancer is eminently curable and good surgical technique is my part to play in helping the patient in his/her journey to be cancer free while maintaining quality of life.”