This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in


Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

  • CLL is the commonest type of leukaemia in the western world
    • the annual incidence rate in this part of world is estimated to be of 4 per 100.000 (1)
    • it accounts for 40% of all cases of leukaemias in people over the age of 65 years
    • it is 20-30 times more commoner in Europe, Australasia and North American white and black populations than in India, China and Japan (1)
  • less than 5% of CLL are T cell type
  • disease is diagnosed most commonly in the elderly
    • it is extremely rare before the age of 30 years (1)
    • the median age at diagnosis is 69 years with 80% of patients diagnosed more than 60 years of age
    • the incidence increases to >30 per 100,000 per year at age of more than 80 years (2)
  • men are affected twice as commonly as women

The role of environmental factors is unclear. Genetic factors may be involved.

  • there may be some overlap between CLL and the leukaemic phase of lymphomas.


Create an account to add page annotations

Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.


Copyright 2024 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.