Why is the person that suffers from leukaemia now more and more

Leukemia is a malignant clonal disease of hematopoietic stem cells. Now the incidence of leukemia is increasing. It may be caused by long-term unsanitary diet and irregular life. It may also be caused by long-term exposure to chemicals or radiation. But it is also related to water and air pollution, decoration pollution, genetic defects and virus infection.