In oncology, cytokines are small signaling proteins released by cells that coordinate immune responses and cellular communication. While they are essential for normal immune function, their overproduction or rapid release in cancer treatment can lead to severe clinical syndromes.
Role in Oncologic Syndromes
- Cytokine Release Syndrome (CRS): This is a “cytokine storm” triggered by widespread immune activation following therapies like blinatumomab or CAR T-cells. It results in abnormally high systemic cytokine concentrations, with Interleukin-6 (IL-6) being a primary driver that causes symptoms like high fever and hypotension.
- Differentiation Syndrome: In patients with APL, the rapid maturation of promyelocytes causes a massive release of cytokines, leading to capillary leak, pulmonary edema, and respiratory distress.
- Tumor Lysis Syndrome (TLS): The rapid death of cancer cells (lysis) releases intracellular contents and triggers a cytokine release that contributes to systemic metabolic derangements and organ failure.
Role in Cancer Growth
- Beyond toxicity, certain cytokines like Interleukin-3 (IL-3) and GCSF (Granulocyte Colony-Stimulating Factor) can actually promote the growth and proliferation of myeloid leukemia cells.