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Radiation Therapy for Colorectal Cancer

Radiation therapy for colorectal cancer is a common treatment that kills cancer cells and shrinks tumors. It often follows or precedes surgery to increase the chances of removing or destroying all the cancer.

While not always the first option for colon cancer, it plays a key role in treating rectal cancer. Depending on the stage and location of the tumor, radiation therapy may be used alone or combined with chemotherapy or surgery.

Radiation Therapy for Colorectal Cancer

When Is Radiation Therapy Used for Colorectal Cancer?

Radiation therapy for colorectal cancer uses powerful energy to kill cancer cells and shrink tumors. Doctors often use it before or after surgery to improve the chances of removing or destroying all the cancer.

Although radiation is not usually the first choice for colon cancer, it plays an important role in treating rectal cancer. Depending on the tumor’s stage and location, doctors may use radiation alone or combine it with chemotherapy or surgery.

Why Choose Radiation Therapy for Colorectal Cancer?

Choosing radiation therapy for colorectal cancer depends on your stage, tumor location, and overall treatment plan. Here are three key reasons why it may be the right option:

Targets Cancer Precisely

With techniques like external beam radiation therapy (EBRT) and intensity modulated radiation therapy (IMRT), radiation can destroy cancer cells while protecting nearby healthy tissues.

Reduces Tumor Size Before Surgery

Radiation is often used before surgery to shrink tumors, making them easier to remove and improving long-term outcomes.

Helps Prevent Recurrence

After surgery, radiation therapy helps eliminate remaining cancer cells, reducing the chance of the cancer coming back.

Types of Radiation Therapy for Colorectal Cancer

There are different types of radiation therapy for colorectal cancer. Each one has its own approach, benefits, and side effects. The most common form is external beam radiation therapy (EBRT).

What to Expect During Radiation Treatments

Radiation therapy is usually done five days a week for several weeks. Each session takes only a few minutes, but the full course can last 5–6 weeks.

During the first visit, your team will perform treatment planning using CT scans or MRIs. This helps map out where to aim the radiation beams.

Measuring Radiation Doses for Safe Treatment

The doses of radiation are carefully measured to ensure they’re high enough to kill cancer cells, but not so strong that they damage healthy organs.

Most people can return to daily activities soon after each session, though rest is still important during treatment.

 

Managing Side Effects of Radiation Therapy

Radiation does not hurt during treatment. Over time, you may feel tired and notice changes in your bowel movements, skin irritation in the treated area, or other short-term effects.

You can often manage these effects with medication, hydration, and small lifestyle changes.

Common Side Effects of Radiation Therapy
Common Side Effects of Radiation Therapy

Common Side Effects of Radiation Therapy

While radiation therapy for colorectal cancer is effective, it can come with side effects. These usually appear after a few weeks and may include:

  • Fatigue: A common side effect due to the body repairing itself.

  • Changes in bowel movements: Some people experience
    diarrhea or constipation.

  • Skin reactions: The treated area may become red, sore, or dry.

  • Urinary discomfort: Radiation near the bladder may cause frequent urination.

Doctors work to prevent or manage these issues through supportive care. IMRT and careful planning help limit side effects by avoiding unnecessary damage to nearby healthy tissues.

Most side effects go away within a few weeks after treatment ends. If you experience anything unusual, it’s important to report it to your care team.

Final Thoughts on Radiation Therapy for Colorectal Cancer

Radiation therapy plays an important role in the treatment of colorectal cancer, especially for rectal tumors. With advanced techniques like EBRT and IMRT, it’s possible to treat colorectal cancers more precisely while minimizing harm to healthy tissues.

At Onco Life Centre, we focus on your full care journey. Our expert team works closely with trusted radiation oncologists to ensure your treatment plan is seamless and coordinated. We help manage each part of your care to provide you with the most effective options and strong support throughout your treatment process.

Understanding your treatment options is key to making the best decision for your health. Whether you need surgery, chemotherapy, or radiation treatments, your care team will create a plan that works for you.

Your Journey

Start Your Recovery

Our dedicated Patient Navigator will assist you with appointment scheduling. Contact us at +6012-3993260 (Call or Whatsapp ).

First Consultation

On appointment day, bring along all the medical reports and your identity documents, ie. identity card or passport. Our team will help you organize the medical reports for our oncologist to review. Our oncologist will discuss the treatment plan with you. Tele-consult is available for overseas patients.

Treatment Day

Come to our center on an agreed date and time for the treatment. Our team will take good care of you. You will be discharged on the same day. Yes, you will get to go home after every treatment visit as no overnight admission is required.

Stay on Track

Our dedicated patient navigator will be following up with you post treatment to check on your condition, to ensure that you are doing well. You will receive a reminder message on your phone for the next appointment date.

Dr. Christina Ng Van Tze
Dr. Christina Ng Van Tze
Consultant Medical Oncologist
Medical Director
MBBS (Melb) FRACP (Aus)
Available
Monday - Friday : 08:00 AM TO 06:00 PM
Saturday : 08:00 AM TO 02:00 PM
DR. JOSEPH K. JOSEPH
D. Joseph K. Joseph
Consultant Medical Oncologist
MBBCH, BAO (IRE) MRCP (UK)
Available
Wednesday : 08:00 AM TO 12:00 PM
Friday : 08:00 AM TO 12:00 PM

Hello, I’m Dr. Christina Ng Van Tze, a Consultant Medical Oncologist and Medical Director at Onco Life Centre, as well as the Founder President of Empowered The Cancer Advocacy Society of Malaysia. Throughout my career, I have been passionate about advancing personalized cancer treatment, strengthening community advocacy, and expanding access to high-quality care for patients across Malaysia.

Attending the ESMO Congress 2025 in Berlin was both inspiring and energizing. Representing Onco Life Centre, our dedicated medical centre in Malaysia, I stood among global leaders committed to shaping the future of oncology. This year’s congress was filled with remarkable scientific breakthroughs, thoughtful discussions, and a renewed sense of purpose as we work toward better outcomes and better lives for our patients.

A Global Gathering Focused on Precision Cancer Care

ESMO 2025 brought together thousands of clinicians, researchers, and advocates from around the world. What made this year particularly exciting was the strong emphasis on precision medicine, from cancer genetics and molecular profiling to advanced imaging and AI-powered diagnostic tools. These advancements are aligning closely with the work we do at Onco Life Centre, where patient individuality and tumor biology guide our treatment decisions.

Throughout the congress, many experts highlighted the importance of understanding each patient’s tumor in greater depth. Whether through genomic sequencing, circulating tumor DNA, or radiomic analyses, the oncology community is moving firmly toward personalized strategies. As someone who has long championed individualized care, I found these sessions especially meaningful.

Key Scientific Sessions That Inspired Me

One of the standout presentations was the evERA BC trial, a major study evaluating the combination of giredestrant, an oral SERD, with an mTOR inhibitor drug in hormone receptor-positive breast cancer. The results showed a significant improvement in progression-free survival, especially in tumors driven by ESR1 mutations. For patients who have progressed on CDK4/6 inhibitors, this combination may become an essential addition to our treatment toolbox.

This study also supports a larger movement within oncology—creating thoughtful, layered treatment plans that address resistance pathways and extend the time patients can remain on endocrine-based therapies. It’s a direction that can profoundly benefit Malaysian women, many of whom are diagnosed at younger ages or have aggressive tumor profiles.

Insights from the thoracic oncology sessions were equally impactful. Advances in lung cancer, including AI-driven pathology models, updated ALK-targeted treatment strategies, and ctDNA-guided therapy adjustments, reminded me just how quickly this field is evolving. Given the increasing prevalence of lung cancer in Malaysia, especially among non-smokers and women, these developments hold tremendous value for our community.

The Role of AI in Transforming Clinical Practice

One major theme across the congress was the integration of artificial intelligence into clinical decision-making. Researchers demonstrated how AI models can analyze pathology slides, radiology images, and genomic data to predict which patients are more likely to respond to immunotherapy or targeted treatment. These tools help us avoid ineffective therapies and guide patients toward options with the most tremendous potential.

At Onco Life Centre, we have been exploring the use of digital technologies to streamline assessments and enhance patient monitoring. Seeing the global oncology community embrace these tools assures me that we are moving in the right direction. I hope that AI will continue to improve early detection, refine treatment selection, and ultimately support better survival outcomes for Malaysian patients.

Representing Onco Life Centre on the International Stage

Representing Onco Life Centre at an event of this scale was a true honor. Our centre has always focused on delivering holistic, science-driven care, and it was wonderful to share our experiences with colleagues from around the world. I had meaningful conversations about challenges related to access to molecular testing globally, variability in treatment availability, and the need for stronger psycho-oncology support systems.

These interactions not only validated the work we do but also highlighted areas where we can continue to grow. Bringing international insights back to Malaysia ensures that our patients benefit from the same cutting-edge thinking shaping care in Europe, America, and beyond.

Bringing ESMO Insights Home to Malaysia

Returning from Berlin, I feel a renewed commitment to integrating the latest research into our daily practice. In the coming months, we aim to:

  • Enhance our use of molecular profiling for breast, lung, and gastrointestinal cancers
  • Expand ctDNA testing where appropriate to guide treatment decisions
  • Strengthen multidisciplinary discussions for complex cases
  • Continue investing in supportive care and psycho-oncology services
  • Provide patients and families with clearer, more personalized education about treatment choices

As a clinician, I believe that every advancement, no matter how technical, must ultimately translate into compassionate, human-centered care. This balance of science and empathy remains at the core of our mission.

A Future of Hope and Collaboration

ESMO 2025 reaffirmed what I’ve always believed: oncology is advancing rapidly, but meaningful progress relies on collaboration, continuous learning, and a deep commitment to patient care. I’m genuinely grateful for the opportunity to represent Onco Life Centre on this global platform. Being part of these critical conversations strengthens our mission to raise the standard of oncology in Malaysia. It ensures our patients benefit from the latest, most effective innovations in cancer care.

Moving forward, we will continue engaging with global partners, conducting meaningful advocacy through Empowered, and ensuring our patients receive the highest standard of personalized treatment.

Together, we can build a future where every individual facing cancer feels seen, supported, and empowered.

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Bringing ESMO Insights Home to Malaysia
Dr Christina Ng Represents Onco Life Centre at ESMO 2025

Onco Life Centre Wins 2025 Best Oncology Clinic in Malaysia

We are proud to share that Onco Life Centre has been named the Oncology Clinic and Treatment Centre of the Year in Malaysia at the GlobalHealth Asia-Pacific Awards 2025, held in Bangkok.

This prestigious recognition is a testament to our unwavering commitment to delivering personalized, compassionate, and cutting-edge cancer care to our patients. The award reflects not just our clinical excellence, but our dedication to safety, community outreach, and innovation in oncology services.

The GlobalHealth Asia-Pacific Awards celebrate leading healthcare institutions across the region. Winners are chosen based on a comprehensive evaluation of criteria such as:

  • Excellence and Innovation: Transforming healthcare delivery and patient outcomes through progressive medical practices.

  • Patient Safety: Upholding the highest standards to ensure safe, comfortable, and effective treatment environments.

  • Community Involvement: Actively engaging in public awareness, screening programs, and care for underprivileged communities.

  • Technology Adoption: Integrating advanced diagnostics, therapies, and digital tools to enhance every aspect of care.

  • Impact and Measurable Results: Demonstrating tangible improvements in cancer detection, treatment success, and patient well-being.

  • Adaptability and Preparedness: Being resilient and forward-thinking in the face of global health challenges.

  • Leadership and Vision: Cultivating a culture that prioritizes empathy, innovation, and ongoing education.

This award inspires us to continue raising the bar in oncology care—not only through medical advancements but by remaining deeply rooted in our advocacy mission: to serve, educate, and empower every cancer patient, especially those most in need.

We dedicate this achievement to our patients, survivors, caregivers, and the entire Onco Life Centre community. Your courage fuels our purpose. Together, we will continue the fight—because every life matters.

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NSCLC (Non-small cell lung cancer)

NSCLC (Non-small cell lung cancer)
NSCLC (Non-small cell lung cancer)

2010 Breast and Lung Cancer Awareness Campaign (LEMBAH PANTAI)

2010 Breast and Lung Cancer Awareness Campaign (LEMBAH PANTAI)
2010 Breast and Lung Cancer Awareness Campaign (LEMBAH PANTAI)

2011 Colorectal Cancer Screening and Treatment Community Project (GOMBAK AND SELAYANG)

2011 Colorectal Cancer Screening and Treatment Community Project (GOMBAK AND SELAYANG)
2011 Colorectal Cancer Screening and Treatment Community Project (GOMBAK AND SELAYANG)

2011 & 2012 Colorectal Cancer Awareness, Screening and Treatment Community Project (SETAPAK)

2011 & 2012 Colorectal Cancer Awareness, Screening and Treatment Community Project (SETAPAK)
2011 & 2012 Colorectal Cancer Awareness, Screening and Treatment Community Project (SETAPAK)

2012 Colorectal Cancer Screening and Treatment Community Project (LEMBAH SUBANG)

2012 Colorectal Cancer Screening and Treatment Community Project (LEMBAH SUBANG)
2012 Colorectal Cancer Screening and Treatment Community Project (LEMBAH SUBANG)

2014 Colorectal Cancer Awareness, Screening and Treatment Community Project (CHERAS)

2014 Colorectal Cancer Awareness, Screening and Treatment Community Project (CHERAS)
2014 Colorectal Cancer Awareness, Screening and Treatment Community Project (CHERAS)

2015 Colorectal Cancer Awareness, Screening and Treatment Project (HILIRAN AMPANG)

2015 Colorectal Cancer Awareness, Screening and Treatment Project (HILIRAN AMPANG)
2015 Colorectal Cancer Awareness, Screening and Treatment Project (HILIRAN AMPANG)

2016 Colorectal Cancer Awareness, Screening and Treatment Project (DESA TUN RAZAK)

2016 Colorectal Cancer Awareness, Screening and Treatment Project (DESA TUN RAZAK)
2010 Breast and Lung Cancer Awareness Campaign (LEMBAH PANTAI)

Credentials You Can Trust

Ministry of Health Malaysia

Ministry of Health Malaysia

Onco Life Centre is fully licensed as an Oncology Consultation and Treatment Centre (License No: 931401-00214-03/2024)

CONSULTANT MEDICAL ONCOLOGIST

DR. CHRISTINA NG VAN TZE

CONSULTANT MEDICAL ONCOLOGIST (NSR: 131550)
MBBS (MELB), FELLOW RACP (AUS)

Leading Cancer Specialist

DR. JOSEPH KANIANTHRA JOSEPH

CONSULTANT MEDICAL ONCOLOGIST (NSR: 124660)
MBBCH, BAO (IRE), MRCP (UK)

Service Area

Over the years, we have had patients from these countries who have visited us for consultation or treatment:
World map highlighting Onco Life Centre’s locations and service areas for advanced cancer treatment, oncology care, and chemotherapy in Malaysia.

Onco Life Centre location

Service Area

Over the years, we have had patients from these countries who have visited us for consultation or treatment:
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Onco Life Centre location

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