Why radiation is given before some cancer operations | CION Cancer Clinics

Radiation before surgery shrinks the tumour and kills cancer cells at its edges, so the surgeon is more likely to remove it with a clear rim of healthy tissue. It also lowers the chance of the cancer growing back in the same place.

It is usually one part of a longer plan

Your report may call this neoadjuvant or preoperative radiotherapy. Both mean radiation given before the main treatment, which is the operation. It is often given together with chemotherapy tablets or drips, which make the cancer cells more sensitive to the radiation. That combination is called chemoradiation.

Where it is most often used

It is a common plan for cancers of the lower bowel and back passage, the food pipe, and soft tissue tumours in the arms and legs. It is also used for some pancreas and lung cancers. For most other cancers, if radiation is needed at all, it comes after the operation.

Why the decision is made by a team

Choosing the order needs a surgeon, a radiation oncologist and a medical oncologist to look at the same scans together. Each sees something different: what can be removed, what can be treated with radiation, and what the drugs can reach. A plan agreed at a tumour board is less likely to miss an option than one made by a single doctor.

It does not suit everyone, even with the same cancer. Your team weighs what it adds against what it can cost you.

When the operation usually comes first

A small, early tumour that can be removed cleanly may not need it. If the same area has had radiation before, giving more may not be safe. A tumour that is bleeding heavily, or blocking the bowel or food pipe, may need attention before a course of several weeks can start.

What radiation does to the operation

Treated tissue is stiffer and heals more slowly. Wound problems after the operation are more common, especially for tumours of the arms and legs. The surgeon plans for this, but it is a real trade-off, not a small print detail.

Effects you may feel along the way

Tiredness builds up during the course. Depending on the area, there may be loose motions, needing to pass urine often, soreness while swallowing or skin that turns red and sore. Most settle in the weeks after treatment. Tell the team early rather than coping silently.

What this page cannot tell you

It cannot tell you how much your tumour will shrink, whether your operation will change because of it, or what your outlook is. Those depend on the type of cancer, its stage and how it responds. Bring these questions to the team that has seen your scans.