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Chronic lymphocytic leukaemia (CLL) is a slow-growing blood cancer that may not need treatment at first. When it does need treatment, there are many effective drugs that can keep the CLL under control.

This information about chronic lymphocytic leukaemia is accredited with the PIF TICK, the UK's only quality mark for trusted health information.

Last full review February 2022. Next full review due February 2025. We may make factual updates to the information between reviews.

The latest review is currently underway as of March 2025, and we are awaiting the publication of new clinical guidelines before making any updates. These guidelines are expected to be confirmed later this year. In the meantime, please speak to your doctor or clinical nurse specialist if you have any questions not covered by the information on these pages.

We would like to thank Consultant Haematologist Dr Piers Patten and Professor Adrian Bloor for checking the clinical accuracy of this information, and Clinical Nurse Specialists Vicki Kitchker and Lianne Palmer for their guidance and support. Thank you also to Ann, David, Eirwen, Erica, John, Gerard, Johanna, Kate, Mel and Paul for supporting this project and sharing their experience of living with CLL.