First of all, a concept to clarify: generally, leukemia is associated with a very high white blood cell count. So, does a decrease in white blood cells lead to leukemia? There is no direct causal relationship between the two.

A reduction in white blood cells generally requires an analysis of its cause—whether it is due to a decline in hematopoietic function, a deficiency in raw materials, or an increase in destruction. These situations essentially involve issues in the production factory or where they are used. We cannot say that people with reduced white blood cells will not develop leukemia, nor can it be stated in that way. They may also, over a period, exhibit a reduction in white blood cells due to certain factors. So, if there are genes causing leukemia combined with other factors, leukemia might occur, but there is no direct causation between the two.