Dr Tan Wah Siew specialises in treating colorectal cancer, as well as benign conditions of the colon, rectum and anus, and has over a decade of experience in helping patients manage their colorectal health. She is an advocate of minimally invasive and robotic surgery in the treatment of colorectal conditions.

Dedicated to furthering her specialty, Dr Tan is a keen researcher with published work in multiple peer-reviewed journals, particularly on minimally invasive and robotic colorectal surgery. She also shares her clinical expertise with medical students and nurses, and has conducted laparoscopic and endoscopic skills training courses for international delegates and surgical residents.