<unk>  is the most common type of leukaemia in the Western world compared to non-Western regions such as Asia, Latin America, and Africa. It is observed globally males are twice as likely than females to acquire<unk> .<unk>  is primarily a disease of older adults, with 9 out of 10 cases occurring after the age of 50 years. The median age of diagnosis is 70 years. In young people, new cases of<unk>  are twice as likely to be diagnosed in men than in women. In older people, however, this difference becomes less pronounced: after the age of 80 years, new cases of<unk>  are diagnosed equally between men and women. According to the American Cancer Society, in the United States, 13,040 males and 8,210 females (total of 21,250 people) are expected to be newly diagnosed with<unk>  in 2021. In that same year, 2,620 males and 1,700 females (total of 4,320 people) are expected to die from<unk> . Because of the prolonged survival, which was typically about 10 years in past decades, but which can extend to a normal life expectancy, the prevalence (number of people living with the disease) is much higher than the incidence (new diagnoses).<unk>  is the most common type of leukemia in the UK, accounting for 38% of all leukemia cases. Approximately 3,200 people were diagnosed with the disease in 2011. In Western populations, subclinical "disease" can be identified in 3.5% of normal adults, and in up to 8% of individuals over the age of 70. That is, small clones of B cells with the characteristic<unk>  phenotype can be identified in many healthy elderly persons. The clinical significance of these cells is unknown. In contrast,<unk>  is rare in Asian countries, such as Japan, China, and Korea, accounting for less than 10% of all leukemias in those regions. A low incidence is seen in Japanese immigrants to the US, and in African and Asian immigrants to Israel. Of all cancers involving the same class of blood cell, 7% of cases are<unk> /SLL. People who live near areas with considerable industrial pollution have an elevated risk of developing leukemia, particularly<unk> .
Chronic lymphocytic leukemia
Hairy cell leukemia
Chronic neutrophilic leukemia
Infectious mononucleosis
AIDS-related lymphoma
Acute lymphoblastic leukemia
Prolymphocytic leukemia
Persistent polyclonal B-cell lymphocytosis