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Acute promyelocytic leukemia (APL) is a subtype of acute myeloid leukemia (AML). This subtype of AML is treated with different medicines than other subtypes. This is because the leukemia cells in APL are often very sensitive to medicines called differentiating agents.
Differentiating agents are medicines. They’re not the same as standard chemotherapy medicines. Chemotherapy normally works by killing cells that grow quickly, such as leukemia cells. But differentiating agents don’t kill the leukemia cells. Instead, they cause them to transform (differentiate) into more mature cells, so they are no longer leukemia cells.
Because these medicines work differently from standard chemotherapy, they tend to have different and often less severe side effects.
The medicines that can be used to treat APL are:
All-trans retinoic acid (ATRA). This is also known as tretinoin. This medicine is a form of vitamin A.
Arsenic trioxide (ATO). This medicine is a form of the chemical arsenic.
These medicines are not used to treat other subtypes of AML.
Differentiating agents are part of the treatment for all people with APL. ATRA is taken daily as a pill. ATO is given as an injection into a vein (IV), either daily or for several days in a row, followed by a rest period. The medicines are given at different times. For example:
ATRA is often used as part of the 1st treatment phase. This phase is known as induction. The goal of this part of treatment is to try to put APL into remission. Remission is when there are no signs of leukemia in the body. In this phase, ATRA is often given along with either a chemotherapy medicine or with ATO.
ATRA and ATO are often also used as part of the 2nd phase of treatment, known as consolidation. The goal of the consolidation phase is to keep the leukemia in remission. This phase usually lasts for several months.
ATRA might also be given as part of a 3rd phase of treatment, known as maintenance. The goal of this phase is to keep the leukemia in remission over a long period of time. The treatment may last a year or more.
ATO can be used if the leukemia comes back (relapses) after treatment with ATRA.
The possible side effects of ATRA include:
Dry skin, dry mouth, or cracking at the corners of the mouth
Sores in the mouth and throat
The possible side effects of ATO include:
Nausea or vomiting
Nerve damage (neuropathy), which can cause numbness, tingling, or pain in the hands or feet
Changes in heart rhythm
Within the first few weeks of treatment, these medicines can sometimes cause a group of side effects known as differentiation syndrome. This syndrome can be life threatening. Symptoms can include:
Breathing problems or cough due to fluid in the lungs
Low blood pressure
Irregular heart beat
Severe fluid retention
If you have symptoms of differentiation syndrome, your doctor may prescribe steroids or have you stop treatment for a few days.
It's important to know which medicines you're taking. Write your medicines down, ask your healthcare team how they work, and what side effects they might have.
Talk with your healthcare providers about what side effects to watch out for, and when to call them. Make sure you know what number to call with questions, even on evenings and weekends.
It may be helpful to keep a diary of your side effects. Write down physical, thinking, and emotional changes. A written list will make it easier for you to remember your questions when you go to your appointments. It will also make it easier for you to work with your medical team to make a plan to manage your side effects.
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