A flexible endoscope is used to inspect the mucosal lining of the entire large intestine, visualize suspicious lesions, note the exact anatomical distance from the anal verge, and take tissue biopsies. Polypectomy may be performed for smaller lesions during the same procedure.
Colorectal Cancer Treatment and Surgery in Singapore
Colorectal cancer treatment in Singapore is planned around your diagnosis, the stage of the cancer, and your general health. This page explains how colon and rectal cancer are investigated, staged, and treated, when surgery may be part of the plan, and which specialists are involved in your care.
What Is Colorectal Cancer?
Colorectal cancer is a malignancy that develops in the colon or the rectum, the two main parts of the large bowel. Colon cancer and rectal cancer are grouped together because they share many structural features, although treatment strategies differ based on anatomical location.
Most colorectal cancers originate as a polyp, a small growth on the inner mucosal lining of the bowel. Polyps are common and mostly benign, but specific adenomatous polyps can undergo malignant transformation over a period of years. Approximately 90 per cent of colorectal cancers are adenocarcinomas, arising from glandular epithelial cells.
According to Singapore Cancer Registry data (2019 to 2023), colorectal cancer is the second most frequently diagnosed cancer in both men and women in Singapore, with 12,950 cases recorded over that five-year period. While most cases occur from age 50 onwards, incidence in individuals under 50 has been increasing. A subset of younger cases is associated with inherited genetic conditions, such as Familial Adenomatous Polyposis (FAP) or Lynch syndrome.
Clinical Context: More than half of individuals diagnosed with early-stage colorectal cancer experience no noticeable physical symptoms. The absence of symptoms does not rule out disease, making formal screening and clinical assessment essential for accurate evaluation.
Symptoms and When to Seek Medical Assessment
Bowel symptoms are common and frequently stem from benign non-cancerous conditions, such as haemorrhoids, localized infections, irritable bowel syndrome (IBS), or inflammatory bowel disease (IBD). However, persistent symptoms warrant formal medical evaluation.
Symptoms Requiring Clinical Review
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- A persistent change in bowel habits lasting more than a few weeks (looser stools, increased frequency, or new-onset constipation)
- Rectal bleeding or dark blood mixed within the stool
- Persistent abdominal pain, cramping, or bloating
- A persistent sensation of incomplete bowel evacuation (tenesmus)
- Unexplained weight loss or persistent fatigue
- Iron deficiency anaemia identified on blood panels without a clear cause
- A strong family history of colorectal cancer or polyps in a first-degree relative
Emergency Triage Warning
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Seek immediate local emergency medical care if you experience heavy rectal bleeding, severe abdominal pain accompanied by vomiting, or signs of acute bowel obstruction (inability to pass stool or wind with abdominal swelling). If you are in the Philippines, go to your nearest emergency department immediately. Do not delay emergency care to plan international travel.
Progression and Diagnostic Workup
Left unmanaged, colorectal cancer can invade progressively through the muscular layers of the bowel wall, spread to regional lymph nodes, and metastasize to distant organs such as the liver or lungs. Growing tumours may also obstruct the intestinal lumen or cause chronic blood loss leading to severe anaemia.
Diagnostic Sequence
Diagnosing colorectal cancer involves a two-step sequence: establishing histological confirmation and determining disease extent (staging).
Colonoscopy and Biopsy
Pathology & Molecular Testing
Biopsy specimens undergo histological analysis by a pathologist to confirm malignancy type. Where clinically indicated, molecular biomarker testing is conducted, including mismatch repair (dMMR/MSI) status and RAS/BRAF gene mutation panels, which inform targeted therapy and immunotherapy selection.
Diagnostic Imaging
Staging and Multidisciplinary Care Planning
Colorectal cancer is staged using the TNM system (Tumour depth, Node involvement, Metastasis).
| Stage | Pathological Description | Primary Clinical Focus |
|---|---|---|
| Stage 0 | Carcinoma in situ; abnormal cells confined to the innermost mucosal lining | Local endoscopic or surgical excision |
| Stage I | Tumour invades submucosa or muscularis propria; no lymph node involvement | Surgical resection alone is typically standard |
| Stage II | Tumour invades through muscularis propria into outer layers; no lymph node involvement | Surgical resection; adjuvant chemotherapy evaluated for high-risk features |
| Stage III | Regional lymph nodes contain cancer cells regardless of T depth | Surgical resection combined with adjuvant systemic chemotherapy |
| Stage IV | Distant metastasis present (most commonly liver, lungs, or peritoneum) | Systemic therapy (chemotherapy, targeted, or immunotherapy) ± targeted surgery |
Multidisciplinary Team (MDT) Review
In Singapore, cancer treatment strategies are routinely established within a Multidisciplinary Tumor Board setting. Colorectal surgeons, medical oncologists, radiation oncologists, radiologists, and pathologists review imaging, pathology, and clinical factors together to formulate a coordinated care plan before initiating therapy.
Colorectal Cancer Surgery in Singapore
Surgical resection aims to remove the bowel segment containing the tumour alongside a healthy margin of tissue, surrounding mesentery, and regional lymph node basins.
Surgical Procedures by Location
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- Polypectomy / Endoscopic Mucosal Resection (EMR): Suitable for very early Stage 0/I cancers contained within a polyp.
- Hemicolectomy (Right or Left): Surgical removal of the right or left portion of the colon.
- Segmental Colectomy / Sigmoidectomy: Resection of a specific segment of the colon, such as the sigmoid colon.
- Anterior Resection / Low Anterior Resection (LAR): Removal of upper or mid-rectal tumours with primary bowel re-anastomosis, preserving sphincter function.
- Abdominoperineal Resection (APR): Removal of the distal rectum, anal canal, and sphincter complex for very low rectal cancers. Requires a permanent colostomy.
Open, Laparoscopic, and Robotic Approaches
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Surgical resections can be performed via open laparotomy or minimally invasive techniques (laparoscopic or robotic-assisted surgery). Clinical trials demonstrate comparable long-term oncological outcomes between high-quality minimally invasive and open colectomies. The choice of surgical approach depends on tumour size, anatomical position, previous abdominal surgery, and operating surgeon assessment.
Stoma Management: Temporary vs Permanent
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- Temporary Diverting Stoma (Ileostomy/Colostomy): Formed to divert stool away from a low rectal join (anastomosis) while it heals, closed during a subsequent minor procedure.
- Permanent Stoma: Required when the anal sphincter complex must be resected (such as in an APR) or when primary bowel rejoining is unsafe.
Distinguishing Colon Cancer Care from Rectal Cancer Care
Systemic and Adjuvant Therapies
- Colon Cancer: Localized resectable colon cancer is managed primarily with upfront surgical resection. Pathology analysis of removed lymph nodes determines whether adjuvant chemotherapy is recommended (standard for Stage III and selected high-risk Stage II disease).
- Rectal Cancer: Because the rectum resides within the narrow bony pelvis near sphincter muscles and pelvic nerves, high-resolution MRI planning is essential. For locally advanced rectal cancer (Stage II/III), neoadjuvant chemoradiotherapy or short-course radiotherapy is frequently administered before surgery to shrink the tumour, lower local recurrence risk, and enhance sphincter preservation possibilities.
Systemic and Adjuvant Therapies
- Chemotherapy: Cytotoxic agents given neoadjuvantly, adjuvantly, or for advanced disease control.
- Radiotherapy: External beam radiation used primarily in rectal cancer pre-operatively or for palliative symptom relief.
- Targeted Therapy: Monoclonal antibodies targeting specific pathways (e.g., anti-EGFR or anti-VEGF agents) prescribed based on RAS/BRAF biomarker status.
- Immunotherapy: Immune checkpoint inhibitors indicated for tumours exhibiting high microsatellite instability (MSI-H) or mismatch repair deficiency (dMMR).
Colorectal Specialists in Singapore
Dr Chok Aik Yong
Consultant Colorectal and General Surgeon
Medical Director, Aelius Surgical Centre
Dr Chok Aik Yong is a General and Colorectal Surgeon practising at Mount Elizabeth Medical Centre and Parkway East Medical Centre in Singapore.
- Qualifications: MBBS (NUS); MRCS (Edinburgh); MMed (Surgery, NUS); FRCS (Edinburgh, 2016).
- Specialist Accreditation: Registered Specialist in General Surgery, Singapore Medical Council.
- Subspecialty Fellowship: Awarded the Ministry of Health Health Manpower Development Plan (HMDP) award for subspecialty fellowship training in advanced colorectal cancer surgery and inflammatory bowel disease at Royal Marsden Hospital, London, UK.
- Clinical Focus: Surgical management of primary, recurrent, and complex colorectal cancer; laparoscopic and robotic colorectal surgery; diagnostic/therapeutic colonoscopy; inflammatory bowel disease.
- Languages Spoken: English, Mandarin, Hokkien, Cantonese, Bahasa Melayu.
Consultation Locations:
- Aelius Surgical Centre: 3 Mount Elizabeth, #12-11 Mount Elizabeth Medical Centre, Singapore 228510
- Parkway East Medical Centre: 319 Joo Chiat Place, #03-06, Singapore 427989
Considering Colorectal Cancer Care in Singapore from the Philippines
All healthcare services described on this website are provided in Singapore. Ascle Healthcare Group does not operate a hospital, clinic, or medical facility in the Philippines.
Preparing Medical Records for Review
Patients in the Philippines considering specialist evaluation in Singapore can submit medical documentation for an initial review prior to travel:
- Colonoscopy and endoscopy reports (including high-resolution procedure images)
- Biopsy and histopathology reports (including molecular marker results if performed)
- Diagnostic imaging reports and digital scan files (CT, MRI, PET-CT)
- Baseline CEA tumour marker levels and laboratory blood panels
- Summaries of prior chemotherapy, radiotherapy, or surgical procedures
- Current prescription list and documented drug allergies
Data Privacy Notice: Submit confidential medical documentation only through secure channels provided by our International Patient Liaison Centre. Do not forward medical records via unsecured public messaging platforms.
Note: Singapore public healthcare subsidies, MediSave, and MediShield Life apply exclusively to Singapore Citizens and Permanent Residents. International patients utilize private self-funding or international health insurance plans.
- 24-Hour Patient Liaison Line: +65 6956 6588
- 24-Hour WhatsApp: +65 8877 3318
Frequently Asked Questions
What is the difference between a Colorectal Surgeon and a Gastroenterologist?
A gastroenterologist is a medical physician who diagnoses and medically manages digestive tract diseases, including performing diagnostic colonoscopies. A colorectal surgeon is a specialist surgeon who performs surgical operations on the colon, rectum, and anus. When colorectal cancer is confirmed, a colorectal surgeon conducts the surgical evaluation and resection.
Can an overseas colorectal cancer diagnosis be reviewed in Singapore?
Yes. Specialists in Singapore routinely review overseas diagnostic records, pathology reports, and scan files. In some cases, original biopsy glass slides or paraffin blocks may be requested for pathology re-review in Singapore, or updated high-resolution imaging may be recommended for surgical planning.
How long does the transition from initial consultation to surgery take?
Timeline varies based on required pre-operative staging, whether additional pathology review is needed, and whether neoadjuvant chemoradiotherapy is indicated prior to surgery. For international patients, many pre-operative evaluations can be coordinated efficiently upon arrival.
Can chemotherapy be continued in the Philippines after surgery in Singapore?
Yes, this is frequently arranged. Following surgery and pathology staging in Singapore, a detailed care summary and recommended chemotherapy regimen can be transferred to your attending oncologist in the Philippines to coordinate local treatment.
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