The human body produces various types of blood cells, each with specific functions. These cells primarily include:

* Leukocytes (White Blood Cells): Cells that fight infections and support the immune system.
* Erythrocytes (Red Blood Cells): Cells responsible for transporting oxygen to tissues and removing carbon dioxide.
* Platelets: Structures that help stop bleeding by aiding in blood clotting.

Normally, the body produces these blood cells in a balanced manner and according to need. However, in some cases, the production of these cells can get out of control; they may begin to proliferate abnormally, rapidly, and excessively. This condition, which usually occurs in the bone marrow, forms the group of diseases known as hematological cancers or bone marrow cancers.