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Cytokine Release Markers – Definition and Significance

Cytokine release markers are laboratory values that indicate an excessive immune response in the body. They help physicians detect and monitor inflammatory processes at an early stage.

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Things worth knowing about "Cytokine Release Markers"

Cytokine release markers are laboratory values that indicate an excessive immune response in the body. They help physicians detect and monitor inflammatory processes at an early stage.

What Are Cytokine Release Markers?

Cytokine release markers are measurable biological substances in the blood that indicate an increased release of cytokines. Cytokines are signaling molecules of the immune system that control and regulate inflammatory processes. When the immune system is excessively activated, these markers can be detected at elevated concentrations, pointing to a so-called cytokine release syndrome (CRS) or other severe inflammatory reactions.

Background: Cytokines and Their Role in the Immune System

Cytokines are small proteins produced by various immune cells – including T cells, macrophages, and natural killer cells. They coordinate the immune response during infections, injuries, or following certain therapies. Key cytokines include:

Interleukin-6 (IL-6): promotes inflammatory responses and the production of acute-phase proteins
Tumor necrosis factor-alpha (TNF-α): involved in the activation of inflammatory cascades
Interleukin-1 beta (IL-1β): mediates fever and systemic inflammatory responses
Interferon-gamma (IFN-γ): activates macrophages and amplifies the immune response

Clinically Relevant Cytokine Release Markers

In clinical practice, various laboratory parameters are used as indicator markers for increased cytokine release:

IL-6 (Interleukin-6): one of the most sensitive and clinically significant markers; markedly elevated in sepsis, severe COVID-19, and following CAR T-cell therapy
Ferritin: an acute-phase protein that rises sharply with massive immune activation; a key marker in macrophage activation syndrome (MAS)
C-reactive protein (CRP): a classic inflammatory marker produced indirectly in the liver through IL-6 stimulation
Procalcitonin (PCT): primarily elevated in bacterial sepsis; helps differentiate infectious causes
sCD25 (soluble IL-2 receptor): a T-cell activation marker; relevant in hematological diseases and hemophagocytic lymphohistiocytosis (HLH)
Lactate dehydrogenase (LDH): marker of cell damage and tissue breakdown
D-dimer: indicates coagulation activation in severe cytokine reactions

Clinical Application and Associated Conditions

Cytokine release markers are used in various clinical contexts:

Cytokine Release Syndrome (CRS)

Cytokine release syndrome frequently occurs as a side effect of modern immunotherapies, particularly following CAR T-cell therapies and the administration of bispecific antibodies. Symptoms range from fever and chills to life-threatening organ failure. Monitoring IL-6 and CRP is essential in this setting.

Sepsis

In sepsis (a life-threatening response to infection), an uncontrolled release of cytokines occurs. IL-6, procalcitonin, and CRP are important prognostic markers for assessing disease severity.

COVID-19

In severe cases of COVID-19, a pronounced cytokine storm was described, with particularly high levels of IL-6, ferritin, and CRP. These markers were used for risk stratification and to guide therapy, including the use of IL-6 inhibitors.

Hemophagocytic Lymphohistiocytosis (HLH) and Macrophage Activation Syndrome (MAS)

In these rare but life-threatening conditions, cytokine release is massively elevated. Ferritin (often exceeding 500 ng/mL, sometimes far higher) and sCD25 are key markers in establishing the diagnosis.

Diagnosis and Interpretation

The interpretation of cytokine release markers always requires clinical context. Individual values are rarely meaningful on their own. Physicians evaluate the pattern of multiple markers over time in conjunction with the clinical presentation. Key aspects in assessment include:

Dynamics of values (rise, plateau, decline)
Combination of multiple markers (e.g., IL-6 + ferritin + CRP)
Clinical context (e.g., ongoing immunotherapy, known infection)
Accompanying findings such as thrombocytopenia, elevated liver enzymes, or coagulation disorders

Treatment for Elevated Cytokine Release Markers

Treatment is guided by the underlying cause and the severity of cytokine release. Key therapeutic options include:

IL-6 inhibitors (e.g., tocilizumab): specifically block the effect of IL-6 and are used in CRS and severe COVID-19
Corticosteroids (e.g., dexamethasone): broadly suppress the excessive immune response
Anti-infective therapy: in septic causes, targeting the pathogen is the primary focus
Intensive care measures: required in severe cases with organ failure

References

Fajgenbaum DC, June CH. Cytokine Storm. New England Journal of Medicine, 2020;383(23):2255-2273.
Shimabukuro-Vornhagen A et al. Cytokine release syndrome. Journal for ImmunoTherapy of Cancer, 2018;6(1):56.
WHO. Clinical management of COVID-19: living guideline. World Health Organization, 2023. Available at: https://www.who.int

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