Treatment Options Explained: Navigating Bowel Cancer Treatments in Australia

A bowel cancer diagnosis can feel overwhelming, especially when it comes to understanding all the possible treatment options. In Australia, treatment for bowel cancer (also called colorectal cancer) can vary depending on the stage of the disease, the location of the tumour, and individual health circumstances. This guide explains the most common treatment options for bowel cancer so you can feel more informed and empowered when discussing your care plan with your medical team.

Each treatment plan is personalised, and it’s important to remember that not everyone will need all of these treatments. Your team will guide you through the options best suited for your situation, but knowing what’s available can help you feel more prepared.

Understanding the Factors That Guide Treatment Decisions

Before diving into the specific treatment options, it helps to understand what influences treatment decisions. Factors considered by Australian oncologists and surgeons include:

• Stage of bowel cancer (whether it’s localised, regional or has spread to other parts of the body)
• Location of the tumour (colon or rectum)
• Biomarker testing and genetic information
• General health, age, and medical history
• Goals of treatment (cure, control, or symptom relief)

Most treatment plans involve a multidisciplinary team, including a surgeon, medical oncologist, radiation oncologist, gastroenterologist, dietitian, and specialist nurses.

Surgery: Often the First Line of Treatment

For many people diagnosed with early-stage or localised bowel cancer, surgery is the most common treatment.

Types of Surgery for Bowel Cancer

• Polypectomy or local excision – Removal of small, early-stage cancers or polyps during a colonoscopy.
• Colectomy – Removal of part or all of the colon.
• Proctectomy – Removal of part or all of the rectum.
• Laparoscopic (keyhole) surgery – Minimally invasive option using small incisions.
• Open surgery – Traditional surgery involving a larger incision.
• Stoma formation – Sometimes surgery may result in a temporary or permanent colostomy or ileostomy.

Surgery for Advanced Bowel Cancer

In advanced cases, surgery may still play a role in:

• Relieving bowel blockages
• Reducing tumour burden
• Removing isolated metastases (like liver or lung lesions)

Chemotherapy: Treating Cancer Cells Throughout the Body

Chemotherapy is commonly used in bowel cancer treatment, either before or after surgery, or as a standalone treatment in advanced cases.

Common Chemotherapy Drugs for Bowel Cancer in Australia

• 5-Fluorouracil (5-FU)
• Capecitabine (Xeloda) – an oral version of 5-FU
• Oxaliplatin (Eloxatin)
• Irinotecan (Camptosar)

When Chemotherapy is Used

• Adjuvant chemotherapy – After surgery to kill any remaining cancer cells.
• Neoadjuvant chemotherapy – Before surgery to shrink tumours.
• Palliative chemotherapy – To manage symptoms and slow cancer growth in advanced cases.

Chemotherapy is often given in cycles, with breaks in between to allow the body to recover. Side effects vary but can include nausea, fatigue, hair thinning, peripheral neuropathy, and increased risk of infections.

Radiation Therapy: Targeting Rectal Cancer

Radiation therapy is more commonly used for rectal cancer rather than colon cancer.

When Radiation Therapy is Used

• Neoadjuvant (before surgery) – To shrink rectal tumours.
• Adjuvant (after surgery) – To reduce the risk of recurrence.
• Palliative – To relieve symptoms such as pain or bleeding.

Radiation is often combined with chemotherapy (called chemoradiation) for enhanced effectiveness.

Targeted Therapy: Precision Medicine for Bowel Cancer

Targeted therapies work by attacking specific molecules involved in cancer growth.

Types of Targeted Therapies Available in Australia

• EGFR inhibitors – Cetuximab (Erbitux), Panitumumab (Vectibix) for RAS wild-type tumours.
• VEGF inhibitors – Bevacizumab (Avastin) to prevent new blood vessel growth.
• BRAF inhibitors – For cancers with BRAF mutations, often used with other drugs.

Biomarker testing helps determine if targeted therapy is suitable.

Immunotherapy: Harnessing the Immune System

Immunotherapy is showing promise in a small percentage of bowel cancer patients whose tumours have certain genetic characteristics, particularly MSI-H (microsatellite instability-high) or dMMR (deficient mismatch repair) status.

Immunotherapy Drugs for Eligible Patients

• Pembrolizumab (Keytruda)
• Nivolumab (Opdivo)

These treatments are not effective for all bowel cancers but can offer durable responses in eligible cases.

HIPEC: Heated Chemotherapy for Advanced Peritoneal Disease

Hyperthermic Intraperitoneal Chemotherapy (HIPEC) is a specialised procedure used for some patients with cancer spread to the abdominal lining.

How HIPEC Works

• Surgery removes visible tumours.
• Heated chemotherapy is circulated within the abdomen during surgery.

This treatment is highly specialised and available at select centres in Australia.

Clinical Trials: Access to Emerging Treatments

Clinical trials can offer access to cutting-edge treatments not yet widely available. Participating in a trial may provide:

• New drug combinations
• Novel immunotherapies
• Personalised medicine approaches

Find trials through:

• Bowel Cancer Australia
• Australian New Zealand Clinical Trials Registry (ANZCTR)
• Your oncologist or treating hospital

Palliative Care: Supportive Treatment at Any Stage

Palliative care is not just for end-of-life situations. It’s about improving quality of life and managing symptoms.

Palliative Care Can Include

• Pain and symptom management
• Emotional and psychological support
• Nutrition advice
• Coordination of services at home or in hospital

Access resources through Bowel Cancer Australia and local palliative care services.

Supportive Therapies to Manage Side Effects

Managing side effects is a critical part of bowel cancer treatment.

Helpful Supportive Therapies

• Anti-nausea medication
• Bowel management plans
• Peripheral neuropathy strategies (e.g., icing during chemo)
• Fertility preservation options
• Nutrition advice tailored to bowel cancer
• Physiotherapy and exercise programs
• Psychosocial support and counselling

Personalised Medicine: The Future of Bowel Cancer Treatment

Advancements in personalised medicine are changing how bowel cancer is treated in Australia.

Key Aspects of Personalised Treatment

• Biomarker testing to guide treatment choices
• Genetic testing for inherited conditions like Lynch Syndrome
• Tailored chemotherapy and targeted therapy plans

Your oncologist can arrange for biomarker testing to ensure the most effective treatment is selected for your specific cancer.

Questions to Ask Your Oncologist About Treatment

When discussing treatment options, consider asking:

• What is the goal of my treatment?
• What are the possible side effects?
• Are there clinical trials I should consider?
• What support services are available?
• Will I need a stoma?
• How will this affect my fertility or family planning?
• How can I best prepare for treatment?

Final Thoughts on Treatment Options for Bowel Cancer

Navigating treatment decisions after a bowel cancer diagnosis can feel like stepping into a whole new world. Understanding the different treatment options, and how they might apply to your individual situation, can help you feel more confident and in control.

Always reach out to trusted resources like Bowel Cancer Australia for up-to-date information, support services, and connection to others going through similar experiences. And remember, your medical team is there to answer your questions and guide you every step of the way.