There is provided a Colony Stimulating Factor (CSF) as an active ingredient for use in the treatment of colon or pancreatic cancer through an increase in neutrophilia, wherein the Colony Stimulating Factor is selected from the group consisting of Granulocyte Macrophage Colony Stimulating Factor (GM-CSF) and Granulocyte Colony Stimulating Factor (G-CSF). The new use for these two recombinant proteins represents a new treatment option for two of the most frequent forms of cancer.
