Once cancer treatment has been recommended, one of the most practical questions is: what is actually going to happen?
The answer depends on the type and stage of cancer, its biological features, your overall health and any other medical conditions you may have. Some people need an operation and no further treatment. Others have radiotherapy, chemotherapy or another drug treatment over several weeks or months. Many people need more than one type of treatment, given in a particular sequence.
Understand what the treatment is trying to achieve
Cancer treatment can have different aims.
For some cancers, treatment is given with the intention of curing the cancer.
Sometimes treatment is given after apparently complete removal of a cancer to reduce the chance of it returning. You may hear this called adjuvant treatment.
Treatment may also be given before an operation — neoadjuvant treatment — to shrink the cancer or improve the effectiveness of the overall treatment strategy.
When a cancer cannot be cured, treatment may still be very worthwhile. It may be used to control the cancer for as long as possible, slow its growth, relieve symptoms or prevent complications.
The aim matters because it influences which treatments are recommended, how long treatment may continue and how doctors judge whether it is working.
If you are unsure of the aim of your treatment, it is reasonable to ask your oncologist directly: “What are we hoping this treatment will achieve?”
What usually happens before treatment starts
Before treatment begins, your team needs to understand the cancer accurately enough to choose an appropriate treatment.
Much of this work may already have happened during diagnosis. Depending on the cancer, it can include review of the biopsy and pathology report, scans to establish the stage, and tests for particular biomarkers or molecular changes that may influence treatment.
You may also need tests to check whether your body can safely receive the proposed treatment. These vary according to the treatment but can include blood tests and assessments of kidney, liver, heart or lung function.
Your oncologist should then explain the treatment being recommended, the expected benefit, the main risks and side effects, and reasonable alternatives. Treatment decisions may also be influenced by other medical conditions, medicines you already take, previous cancer treatment and your own priorities.
This discussion is more than a formality before signing a consent form. It is where you should understand why this particular treatment has been chosen for you.
Cancer treatment is often a sequence, not a single event
Different treatments do different jobs.
Surgery treats cancer in a particular part of the body by removing it.
Radiotherapy uses radiation directed at a defined area.
Systemic treatments travel through the bloodstream and can reach cancer cells in different parts of the body. These include chemotherapy, hormone therapy, targeted therapy and immunotherapy, among others.
A treatment plan may combine these approaches. For example, surgery may be followed by drug treatment or radiotherapy. In another cancer, drug treatment may come first and surgery later. Some cancers are treated mainly with medicines and do not require surgery at all.
The sequence is therefore part of the treatment itself. One treatment may prepare for another, reduce the risk of recurrence or treat cancer cells that cannot be removed locally.
Treatment schedules can look very different
An operation may happen on a single day, although recovery takes longer.
Radiotherapy is commonly divided into a planned number of treatment sessions.
Some cancer medicines are given through a vein in a day-care unit. Others are injections or tablets taken at home. Certain treatments are given continuously, while others are given in cycles — a treatment period followed by time for the body to recover.
This means that two people who both say they are “having cancer treatment” may have completely different schedules.
Before you start, you should be told where treatment will take place, how often you need to attend, approximately how long the planned course will last and what monitoring will be required.
What happens while you are receiving treatment?
Cancer treatment is rarely simply administered and then left unchecked.
Your team will review you at intervals. Depending on the treatment, this may include asking about symptoms and side effects, examining you, checking your weight or other measurements, and repeating blood tests.
These reviews help answer two separate questions:
Is the treatment safe enough to continue?
and
Is the treatment achieving what we want it to achieve?
Blood counts, kidney or liver tests, for example, may be used to make sure treatment can be given safely. A scan may be used at a different point to assess what the cancer itself is doing.
How will the doctors know whether treatment is working?
The way doctors assess treatment depends on the type of treatment you have received.
After surgery, the pathology report provides the most important information. It helps show whether the cancer has been completely removed and whether any further treatment may be needed.
After radiotherapy or drug treatment, doctors usually assess response with scans. In some cancers, tumour markers or other relevant tests may also help show how well the treatment is working.
The timing and type of assessment will depend on the cancer and the treatment given.
Side effects are monitored as part of treatment
Most cancer treatments can cause side effects, but the type and severity depend greatly on the treatment.
Before starting, your team should explain which side effects are common, which are less common but serious, what can usually be managed at home and when you should contact the hospital.
Not everyone experiences every listed side effect. Conversely, a side effect that seems minor can occasionally matter medically. For example, fever during some forms of chemotherapy may require urgent assessment.
For that reason, follow the instructions given by your own oncology team rather than relying on a general list of side effects.
You should know who to contact during working hours and outside working hours if you become unwell during treatment.
Treatment plans sometimes change
Patients are sometimes worried when an oncologist postpones treatment, changes a dose or recommends a different treatment.
A change does not automatically mean that something has gone wrong.
Doctors may adjust treatment because blood counts have not recovered, an organ needs more time to recover, side effects have become significant, new information has become available, or the cancer has responded differently from expected.
Occasionally the original treatment is stopped because another option is more appropriate.
Cancer treatment is planned in advance, but it is also continually reassessed. The aim is not simply to follow the original calendar at all costs. It is to give treatment in a way that remains appropriate for the cancer and safe for the person receiving it.
There may be periods when nothing seems to be happening
Cancer care often contains gaps that can feel surprisingly long.
There may be time between surgery and the pathology result, between treatments, while blood counts recover, before radiotherapy planning is completed, or between finishing treatment and the first follow-up scan.
Some of these intervals are deliberate parts of treatment rather than delays.
If you do not understand why you are waiting, ask. Your team should be able to explain what is happening during that interval and whether the timing is medically expected.
What happens when treatment finishes?
Finishing a planned course of treatment does not necessarily mean that all cancer care stops.
What happens next depends on the reason for treatment.
After treatment intended to cure cancer or reduce the risk of recurrence, you may enter a period of follow-up or surveillance. This can involve clinic reviews, examinations, scans or other tests, depending on the cancer.
Some treatments continue for years — hormone treatment for certain breast or prostate cancers is one example — even though more intensive treatment has finished.
When treatment is being used to control advanced cancer, there may not be a fixed “last treatment”. Treatment may continue while it is helping and remains tolerable, followed by reassessment and, when necessary, a discussion about another approach.
Questions worth having answered before you start
You do not need to understand every technical detail of oncology. You should, however, understand the plan you are agreeing to.
Useful questions include:
- What is the aim of this treatment?
- Why is this treatment being recommended for my cancer?
- What treatments will I receive, and in what order?
- How long is the planned treatment likely to take?
- How will we know whether it is working?
- Which side effects should make me contact the cancer team urgently?
- Could the plan change depending on how the cancer or my body responds?
- What happens after this part of treatment is finished?
The answers will be different for every cancer and every treatment plan. But they give you a framework for understanding what is happening rather than experiencing treatment as a series of unexplained appointments.
Cancer treatment often makes more sense when you can see the purpose of each step: what is being treated, what that particular treatment is meant to achieve, how your team will monitor you, and what will determine what happens next.