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Cytokine Release Syndrome (CRS) – Definition & Treatment

Cytokine release syndrome (CRS) is a severe immune reaction in which the body releases excessive amounts of cytokines. It can be triggered by infections, immunotherapies, or certain medications.

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Things worth knowing about "Cytokine release syndrome"

Cytokine release syndrome (CRS) is a severe immune reaction in which the body releases excessive amounts of cytokines. It can be triggered by infections, immunotherapies, or certain medications.

What is Cytokine Release Syndrome?

Cytokine release syndrome (CRS) is a potentially life-threatening condition caused by an overactivation of the immune system. Large amounts of cytokines – signalling proteins that normally coordinate immune responses – are released in a short period of time. This uncontrolled release triggers a systemic inflammatory response that can affect multiple organs simultaneously.

Causes

CRS can be triggered by several different factors:

Immunotherapies: CAR-T cell therapies and monoclonal antibodies (e.g., blinatumomab, tocilizumab) are among the most common medical triggers.
Infections: Severe infections such as sepsis or viral diseases (e.g., COVID-19, influenza) can trigger CRS.
Transplantations: Rejection reactions following stem cell or organ transplantations.
Autoimmune conditions: Disorders such as macrophage activation syndrome (MAS) can trigger similar mechanisms.

Symptoms

The symptoms of CRS range from mild to life-threatening and are classified by severity grade:

Mild Symptoms (Grade 1–2)

Fever (above 38°C / 100.4°F)
Fatigue and weakness
Headache
Nausea, vomiting, or diarrhoea
Muscle and joint pain

Severe Symptoms (Grade 3–4)

Severely low blood pressure (hypotension)
Shortness of breath and low oxygen levels
Organ failure (kidneys, liver, heart)
Neurological symptoms such as confusion or seizures
Life-threatening shock

Diagnosis

CRS is diagnosed clinically in combination with laboratory tests. Key diagnostic measures include:

Measurement of inflammatory markers in the blood: Interleukin-6 (IL-6), C-reactive protein (CRP), ferritin, D-dimers
Complete blood count to assess white blood cells and platelets
Kidney and liver function tests to monitor organ health
Imaging (X-ray, CT scan) if pulmonary involvement is suspected
Assessment using standardised grading scales (e.g., ASTCT criteria)

Treatment

Treatment depends on the severity of the syndrome:

Mild Cases

Close monitoring of vital signs
Symptomatic therapy: antipyretics (e.g., paracetamol) for fever management and adequate fluid intake

Severe Cases

Tocilizumab: An antibody that blocks the interleukin-6 receptor and suppresses the inflammatory response – considered a first-line treatment for severe CRS
Corticosteroids (e.g., dexamethasone): To suppress the immune response
Intensive care management in cases of organ failure or shock
Supportive measures: supplemental oxygen, blood pressure stabilisation, renal replacement therapy if needed

Mechanism of Action

In CRS, immune cells – particularly T lymphocytes and macrophages – become massively activated. These cells release large quantities of pro-inflammatory cytokines, including Interleukin-6 (IL-6), Interleukin-1 (IL-1), Tumour Necrosis Factor-alpha (TNF-α), and Interferon-gamma (IFN-γ). These signalling molecules amplify each other in a self-reinforcing cycle known as a cytokine storm, which can cause systemic damage to blood vessels and organs throughout the body.

References

Lee DW et al. - ASTCT Consensus Grading for Cytokine Release Syndrome and Neurologic Toxicity Associated with Immune Effector Cells. Biology of Blood and Marrow Transplantation, 2019.
Shimabukuro-Vornhagen A et al. - Cytokine release syndrome. Journal for ImmunoTherapy of Cancer, 2018.
World Health Organization (WHO) - COVID-19 and Cytokine Storm: Scientific Brief, 2020. Available at: https://www.who.int

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