👉 Leukemia is a type of cancer that occurs in white blood cells, also known as red blood cells. These cells are responsible for fighting off infections and diseases by helping to kill infected or diseased cells. If leukemia is not treated promptly and effectively, it can lead to serious health problems such as bone marrow failure, which can cause the body to reject healthy blood cells. Leukemids are a type of leukemia that occurs in white blood cells called leukocytes. These cells play an important