Colony Stimulating Factors (CSFs) are a group of glycoproteins that play a crucial role in the hematopoietic system by stimulating the bone marrow to produce more blood cells. They are vital in the regulation of white blood cells, red blood cells, and platelets. In the context of cancer, CSFs are particularly important because they help mitigate the adverse effects of chemotherapy and other cancer treatments, which often result in myelosuppression—the decreased production of blood cells.