Cancer Treatment — When You Are on Dialysis

Most chemotherapy regimens can be given with dose adjustments. The specific drugs, doses, and timing around your dialysis sessions depend on which drugs are being used and whether dialysis removes them from your blood. Some drugs are given after dialysis so they are not cleared before they can act; others are given before. Your oncologist will plan this with your dialysis team before your first cycle starts, not on the day of treatment.

It depends on the drug. Dialysis removes some chemotherapy drugs significantly and others barely at all. This matters because a drug dialysis clears quickly may need to be given right after a session so it has time to act before the next one. Your oncologist should know the dialytic clearance profile of every drug in your regimen. Ask them to explain the timing plan so you understand why treatment is scheduled when it is.

For drugs that the kidneys would normally clear, yes — the dose is usually reduced to prevent the drug building up to harmful levels. For drugs cleared by the liver rather than the kidneys, the dose may not change at all. A lower dose does not mean less effective treatment. It means the dose is matched to your body's actual clearance capacity, not a standard starting point designed for patients with working kidneys.

Yes. Checkpoint inhibitors — the most common type of immunotherapy — are not primarily cleared by the kidneys. There is a growing body of case reports and small series showing they can be used safely in dialysis patients, and ASCO guidance notes that routine dose adjustment is not generally required for these agents in renal impairment. Your oncologist will monitor for immune-related side effects as they would any immunotherapy patient, and your dialysis team should know what you are receiving so both teams are watching the same picture.

Radiation therapy does not pass through the kidneys and does not require dose adjustment for dialysis. Whether you can have it depends on the site being treated and your overall fitness, not on your dialysis status alone. If the treatment site is near your dialysis access — an arteriovenous fistula or graft, for example — your care team will plan carefully to protect it. Tell your radiation oncologist exactly where your access is before planning begins.

Surgery is possible, but it requires careful planning around your dialysis schedule and cardiovascular health. Dialysis patients carry a higher anaesthetic risk than the general population, so your surgeon will want to involve your nephrologist before any operation. Whether surgery is the right option depends on your cancer stage, your overall fitness, and what the procedure is expected to achieve. Your oncologist should answer these questions clearly before any decision is made.

Tell them the names of every cancer medicine you are receiving, when your treatment cycles are scheduled, and what side effects to expect. Chemotherapy can lower your white cell count, which changes how your dialysis team monitors you for infection. Bring your full medicine list to every dialysis session. If you feel unusually unwell during dialysis after a chemotherapy cycle — feverish, faint, or in pain — tell the nurse immediately rather than waiting until you are home.

It can be, and your team should tell you this honestly. Dialysis patients often have less reserve — nutritionally and cardiovascularly — and blood counts can take longer to recover after chemotherapy. Side effects may feel more pronounced or last longer. This does not mean treatment is not worth doing. It means your team will monitor you more closely and may adjust the pace or intensity based on how you respond. The aim is the best possible chance of benefit while keeping side effects at a level you can manage.