Leukemia is commonly referred to as "Cancer of the Blood" because it primarily affects the blood cells, specifically the white blood cells. In this condition, the bone marrow produces an excessive amount of abnormal white blood cells, which do not function properly. This leads to a range of health issues, as these dysfunctional cells can interfere with the body’s ability to fight off infections, regulate bleeding, and support normal blood function.
The term "cancer of the blood" aptly encapsulates the nature of leukemia, distinguishing it from solid tumors or cancers that predominantly affect other organs, such as the ones represented by the other options. Liposarcoma, for example, is a cancer that arises from fat tissue and presents as a mass; pancarditis refers to inflammation of the heart, not cancer; and osteoma is a benign bone tumor. Hence, understanding leukemia's impact specifically on blood cells elucidates why it is designated as "Cancer of the Blood."