Chronic myeloid leukaemia

Also called CML or Chronic myelogenous leukaemia

Chronic myeloid leukaemia is a cancer of the white blood cells that starts in the bone marrow. It is caused by a gene change that creates the BCR-ABL gene, often called the Philadelphia chromosome. It usually develops slowly, and targeted tablets mean most people can now live a normal or near-normal life.

Last updated Nov 9, 2026

What it is

It mostly affects adults and is often found on a routine blood test.

Treatment is with daily tablets called tyrosine kinase inhibitors. Regular blood tests measure the amount of BCR-ABL to show how well treatment is working. Some people in deep remission can stop treatment under close monitoring.

Common signs

  • Often no symptoms at first
  • Tiredness
  • Weight loss and night sweats
  • A swollen tummy or discomfort under the left ribs from an enlarged spleen
  • Bruising or bleeding easily

How it is usually diagnosed

  • Full blood count
  • Bone marrow test
  • Tests for the Philadelphia chromosome and BCR-ABL gene

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Full blood count results
  • BCR-ABL (PCR) results over time
  • Bone marrow reports
  • Your medicine, dose and any side effects

Questions to ask your doctor

  • How is my BCR-ABL level changing?
  • What side effects should I report?
  • Could I ever stop treatment?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Severe bleeding, fever with feeling very unwell, or sudden severe pain under the left ribs

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources