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Treatment and the treatment process

Maintenance therapy

Maintenance therapy is the longest but gentlest phase of ALL treatment. It is usually carried out at home and is very important for keeping the leukemia from returning.

Last updated: ~2 min read
A calm river of teal light winding through a dark navy landscape to a distant warm horizon.
Figure 1.Maintenance therapy is a long, calm road.

01Short answer

In ALL, maintenance therapy continues for 1.5–2.5 years after the intensive phases. It is built on daily mercaptopurine (6-MP) tablets and weekly methotrexate; some protocols add periodic vincristine and short steroid courses, plus intrathecal drugs to protect the central nervous system. Doses are adjusted according to white cell and neutrophil counts. In Ph+ ALL, the TKI continues. Maintenance is also used in APL (in some regimens) and in some AML (for example oral azacitidine or an FLT3 inhibitor). During this time many people return to school or work.

02Simple explanation

Why so long? Time is needed to destroy slowly dividing hidden cells.

How? Mostly tablets at home.

Monitoring. Regular blood tests and dose adjustment.

Life. School, work and hobbies often continue.

03Scientific explanation

Drugs: mercaptopurine disrupts purine metabolism and methotrexate disrupts folate metabolism. Variants in the TPMT and NUDT15 genes increase sensitivity to mercaptopurine, so these tests may be done before treatment (NCI).

Dose titration: the aim is to keep the white cell count within a set range; doses are lowered if counts are too low and raised if they are high. Liver tests are also monitored.

Adherence: studies have shown that taking mercaptopurine irregularly clearly increases the risk of relapse. Advice on timing and on dairy products varies between protocols.

04What happens in the body?

A daily rhythm

Tablets are usually taken at the same time each day, often in the evening. A phone reminder or pill box can help.

On a dark surface, a row of seven small glowing tablets and one larger tablet set apart.
Figure 2.Daily and weekly tablets.

Regular checks

Blood tests are usually every 2–4 weeks. The doctor may change the dose based on the results. With a fever, jaundice or bleeding, do not wait for the next check.

A bridge of light with evenly spaced glowing arches over a calm dark river.
Figure 3.Regular blood tests help adjust the dose.

The end of treatment

When maintenance ends, treatment stops and follow-up begins. This can bring both joy and worry — these feelings are normal.

05The maintenance phase

A simplified outline.

Start — After intensive phases.1StartAfter intensive phases.
Daily tablet — Mercaptopurine.2Daily tabletMercaptopurine.
Tests — Dose adjustment.3TestsDose adjustment.
End — Moving to follow-up.4EndMoving to follow-up.
Lower relapse riskThe main goal.
Normal lifeSchool and work.
Genetic testTPMT, NUDT15.

06Elements of maintenance therapy (ALL)

ElementHowNote
MercaptopurineDaily tabletDose by blood counts
MethotrexateOnce a weekBy mouth
Vincristine + steroidPeriodicallyIn some protocols
Intrathecal drugPeriodicallyCNS prevention
TKIDailyPh+ ALL
Blood testsEvery 2–4 weeksFor dose adjustment

* Protocols differ; your doctor sets your plan.

07Key terms

Maintenance therapy
A long, gentle treatment phase.
Mercaptopurine (6-MP)
The main tablet of ALL maintenance.
Methotrexate
A drug that disrupts folate metabolism.
TPMT / NUDT15
Genes affecting how mercaptopurine is broken down.
Titration
Adjusting the dose to test results.
Adherence
Taking the medicine exactly as prescribed.

08Key points

  • Maintenance is long but gentle.
  • It is mostly tablets at home.
  • The dose changes with test results.
  • Regular dosing lowers relapse risk.
  • Call with fever or jaundice.
  • Many return to normal life.

09Frequently asked questions

What if I miss a dose?

Do not double it; follow the rule your team gave you.

Can I have vaccinations?

Live vaccines are usually not given; plan others with your doctor.

Do I need sun protection?

Yes, methotrexate can make the skin more sensitive to sun.

Can I drink alcohol?

Methotrexate and mercaptopurine affect the liver; discuss this with your doctor.

10Questions for your doctor

Take these questions to your appointment. The ones you save are collected on the “My questions” page and stay on this device only.

  1. What if I miss a dose?

  2. Can I have vaccinations?

  3. Do I need sun protection?

  4. Can I drink alcohol?

My questions

12Sources

  1. National Cancer Institute (NCI). Adult Acute Lymphoblastic Leukemia Treatment (PDQ) – Patient Version
  2. National Cancer Institute (NCI). Childhood Acute Lymphoblastic Leukemia Treatment (PDQ) – Patient Version
  3. American Cancer Society. Treating Leukemia in Children
  4. Cancer Research UK. Chemotherapy
  5. Leukemia & Lymphoma Society. ALL maintenance therapy
  6. Children’s Cancer and Leukaemia Group (CCLG). Acute lymphoblastic leukaemia (ALL)
  7. MedlinePlus. Steroids
  8. MedlinePlus. COPD
  9. MedlinePlus. Asthma
  10. MedlinePlus. Liver Diseases
Medical disclaimerThis information is for educational purposes only and does not replace medical advice.
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