Whenever there is a rise in WBC level of the body.....its an indication that some foreign germ has entered into our body.In Leukemia ,the cancer cells which try to destroy the RBC's are fought against by the WBC's .....hence to fight against these blood cancer cells the WBC count of the body increases......hope i helped u:)
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Leukemia is a group of cancers that usually begin in the bone marrow and reult in high no.s of abnormal WBC. these are called leukemia cells. 
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