Radiation therapy for pancreatic cancer
Why radiation may be recommended for pancreatic cancer, what planning and treatment involve, side effects, and how it fits with the rest of your care.
Patient Resources → Treatment Options → Radiation Therapy
Radiation therapy treats a specific area of the body. For pancreatic cancer, it may be recommended to help control the cancer, support a treatment plan involving surgery, or relieve symptoms. Not everyone needs radiation — your team considers the cancer, your health, other treatments, and the goal of care when deciding whether to recommend it.
This guide primarily concerns pancreatic ductal adenocarcinoma, the most common type of pancreatic cancer. Treatment for other tumour types can differ.
This guide is general information, not medical advice.
Why radiation may be offered
| Situation | Possible purpose |
|---|---|
| Cancer that cannot be removed surgically | Help control the cancer in the treated area |
| Before surgery, in selected circumstances | Form part of treatment intended to make removal more feasible |
| After surgery, in selected circumstances | Treat possible remaining cancer cells and reduce the risk of local recurrence |
| Advanced or metastatic cancer | Relieve pain or other symptoms in a particular area |
These are possible uses — not a standard sequence that everyone follows. The Canadian Cancer Society describes radiation as an option in these settings, with the plan individualized to the person and the cancer.
Because radiation treats a particular area, it is different from chemotherapy, which acts throughout the body. Your team will explain why one, both, or neither is appropriate.
Why is chemotherapy sometimes given with radiation?
Some chemotherapy medicines make cancer cells more sensitive to radiation. When the treatments are given during the same period, this is called chemoradiation. Whether to combine them depends on the treatment plan — ask which medicine is being used, why it is included, and what additional side effects to expect. See also chemotherapy for pancreatic cancer and surgery for pancreatic cancer.
The main techniques
External beam radiation therapy. A machine directs radiation toward the treatment area from outside the body. The schedule depends on the prescribed plan.
Stereotactic body radiation therapy (SBRT). SBRT delivers highly targeted radiation in fewer sessions than conventional courses. It may also be called stereotactic ablative radiotherapy, or SABR. It is not appropriate for every person or tumour.
Imaging can help position and guide treatment. Image guidance is a way of delivering radiation accurately — not necessarily a separate treatment choice competing with SBRT.
What happens before treatment?
Before treatment begins, you will have a planning appointment. Your centre will give you specific instructions about imaging, positioning, preparation, and how to stay in the required position. Pancreatic radiation may also involve techniques to account for movement during breathing. Use your treating centre’s patient handout for the details, and ask:
- Will I need a planning scan?
- Do I need to change when I eat or drink?
- Will I need to follow breathing instructions?
- Are any additional procedures required before planning?
- What should I do if pain or nausea makes positioning difficult?
How many appointments will I need?
The number of treatments depends on the technique and goal. Some courses involve weekday visits over several weeks, while SBRT usually uses fewer sessions. Ask for your own schedule before arranging travel or accommodation — planning appointments may be separate from treatment visits. Travelling for treatment? Explore financial and travel support →
Side effects and when to contact your team
Common effects include fatigue, nausea or vomiting, reduced appetite, diarrhea, weight loss, and skin changes in the treatment area. Side effects depend on the area treated, nearby organs, dose, schedule, and other treatments. Report symptoms early rather than simply tolerating them.
Tell your team if symptoms are making it difficult to eat, drink, take medicines, or manage at home. Ask for written instructions about when to call urgently and whom to contact after hours.
Some problems can also develop later, after treatment ends. A Canadian SBRT guide from CHU de Québec describes uncommon but potentially serious effects involving the stomach or bowel, including ulcers and bleeding. Your team will explain which late effects are relevant to your plan.
Support during radiation
- Appetite changes, nausea, or weight loss affecting eating? See nutrition and digestion with pancreatic cancer.
- Symptoms affecting daily life? See palliative care and symptom support.
- Feeling the emotional weight? Emotional & mental health support.
- Travelling for treatment? Financial support during pancreatic cancer, including Port to Care.
- Supporting someone in treatment? The Caregivers Hub.
Questions to ask your care team
- What is the goal of radiation in my situation?
- Why do you recommend it at this point?
- What area will be treated?
- Which technique are you recommending, and why?
- Will chemotherapy be given at the same time?
- How many planning and treatment appointments should I expect?
- What side effects are most relevant to my plan?
- Which symptoms require urgent help?
- How will you assess whether treatment has helped?
- What are the alternatives, including not having radiation?
Related guides
Sources
- Canadian Cancer Society — Radiation therapy for pancreatic cancer
- Canadian Cancer Society — Chemotherapy for pancreatic cancer
- CHU de Québec — Guide d’information en radio-oncologie (SBRT)
- BC Cancer — Radiation therapy booklet
Last reviewed: October 24, 2026