CML: Comparing Treatment Options

CML treatment depends heavily on which phase you are in: chronic, accelerated, or blast phase. Most people are diagnosed in chronic phase, which has the best outlook and the most treatment options. Ask your team to confirm your phase and explain how it was determined.

Chronic-phase CML is treated with daily pills called tyrosine kinase inhibitors, or TKIs. These block the abnormal protein made by the BCR::ABL1 gene, the genetic change that drives CML. Options include imatinib, dasatinib, nilotinib, bosutinib, and asciminib. Your team weighs several things when choosing your first drug: your phase, other health conditions, and possible side effects, such as fluid retention, blood pressure changes, or blood clot risk.

For most people, the goal of a TKI is long-term control, taken indefinitely. Regular PCR blood tests track how much BCR::ABL1 is left. Some people reach a very deep, sustained response for years. They may be able to discuss stopping the drug carefully with their team. This is not right for everyone, and needs close monitoring if tried.

A TKI can stop working. Testing might also find a new mutation making the leukemia resistant. Either way, your team may switch to a different TKI. Ponatinib is used for CML with a specific resistant mutation called T315I. Stem cell transplant is considered for people who do not respond to TKIs, or who progress to a more advanced phase. In this procedure, healthy donor cells replace your bone marrow.

These more advanced phases need more urgent, intensive treatment. Options include switching TKIs or adding a stem cell transplant. For blast phase, treatment resembles acute leukemia therapy, sometimes combined with a TKI. Blast phase behaves aggressively and needs prompt evaluation by a specialist.

TKIs are usually easier to tolerate than older chemotherapy, but they are not free of risk. Common side effects include nausea, muscle cramps, fluid buildup, and fatigue. Some TKIs carry a higher risk of blood clots, or heart and lung problems. That is part of why the specific drug is chosen carefully. Stem cell transplant offers a chance at cure in harder cases. But it carries real risks, including infection. One risk, graft-versus-host disease, happens when donor immune cells attack your body.

• What phase is my CML in, and what does that mean for urgency?
• Why was this specific TKI chosen as my first treatment?
• What are the target BCR::ABL1 levels at each check, and when are they?
• What side effects should prompt a call before my next visit?
• Am I ever a candidate to discuss stopping treatment, and under what conditions?

• Call 911 or go to an emergency department if you get chest pain or pressure, sudden breathlessness, or you cough up pink or bloody mucus. Some TKIs cause fluid to build up around the lungs, and some raise the risk of clots.
• Call 911 or go to an emergency department if one side of your body goes weak or numb, your speech slurs, or you faint. These can be signs of a blocked artery.
• Call 911 or go to an emergency department if bleeding will not stop, or your stools are black and tarry.
• Call your care team the same day if you record a temperature of 100.4°F (38°C) or higher, or get shaking chills. Tyrosine kinase inhibitors can drop the neutrophil count, particularly in the first months and in accelerated or blast phase, so a fever on a TKI is not something to write off as an ordinary bug. Your team needs to hear about it and check your counts. If you already know your neutrophils are low, or nobody has checked them recently, treat a fever as an emergency and ring at once, whatever the hour — use an emergency department if the call goes unanswered. Follow whatever threshold your own team has given you.
• That changes if your treatment is more than the tablet. During chemotherapy, or around a transplant, the same 100.4°F (38°C) reading is a medical emergency in CDC's wording. Ring the hematology team the moment you see it, whatever the hour, and use an emergency department if the call goes unanswered.
• Call your care team the same day if your heartbeat feels fast, pounding, or irregular.
• Call your care team the same day if you gain weight quickly, or your ankles, hands, or the area around your eyes swell up. TKIs can cause the body to hold on to fluid.
• Call your care team within a day or two if you bruise easily, get new bone pain, or the fullness under your left ribs grows. Ask to be seen sooner rather than waiting for your next PCR test.
• Call your care team within a day or two if drenching night sweats or unexplained weight loss start. These can point to the disease moving into a more advanced phase.

• National Cancer Institute — Chronic Myeloid Leukemia Treatment (PDQ).
• MedlinePlus — Dasatinib.