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TLS Risk Classification

TLS Prophylaxis: Identification of risk is critical BEFORE starting chemotherapy. High-risk patients (Burkitt, high WBC AML/ALL) require Rasburicase to prevent renal failure.

1. Malignancy Profile

2. Burden Variables

TLS Risk Result

Low Risk

Management Priority

Hydration sufficient

Aggressive Hydration (3L/m²/d)

Guidelines & Evidence

Clinical Details

Section 1

When to Use

Assessing patients before the initiation of chemotherapy for hematologic malignancies.

Identifying high-risk candidates who require aggressive prophylaxis with Rasburicase.

Evaluating patients with bulky solid tumors sensitive to therapy.

Diagnostic Definition (Cairo-Bishop)

Laboratory TLS is defined by ≥ 2 of the following electrolyte abnormalities within 3 days before or 7 days after therapy: Uric Acid > 476 µmol/L (8 mg/dL), Potassium > 6.0 mmol/L, Phosphorus > 1.45 mmol/L, or Calcium < 1.75 mmol/L.

Section 2

Formula & Logic

High Risk Malignancies

Burkitt Lymphoma (Advanced Stage).

Lymphoblastic Lymphoma (Advanced Stage).

ALL with WBC ≥ 100 × 10⁹/L.

AML with WBC ≥ 100 × 10⁹/L.

Large B-cell Lymphoma with bulky disease (≥ 10 cm) and elevated LDH (> 2x ULN).

Management Paradigm

Risk Class	Primary Prophylaxis
Low Risk	Vigorous Hydration ± Allopurinol
Intermediate	Vigorous Hydration + Allopurinol
High Risk	Vigorous Hydration + Rasburicase (0.2 mg/kg)

Section 3

Pearls/Pitfalls

The Rasburicase Pivot

Rasburicase acts rapidly to degrade existing uric acid. It is contraindicated in patients with G6PD deficiency due to the risk of severe hemolysis and methemoglobinemia.

Hydration Strategy

The cornerstone of TLS management is aggressive hydration (2,500–3,000 mL/m²/day) to maintain a high urine output (> 100 mL/hour), facilitating the excretion of uric acid and phosphorus.

Section 4

Evidence Appraisal

Primary Strategy

Tumour lysis syndrome: new therapeutic strategies and classification.

Cairo MS et al. • British Journal of Haematology. 2004;127(1):3-11. (The Cairo-Bishop Criteria)

View Source

Guidelines for the management of pediatric and adult tumor lysis syndrome: an evidence-based review.

Coiffier B et al. • Journal of Clinical Oncology. 2008;Consensus on risk groups.

View Source

Section 5

Literature

History

The Cairo-Bishop criteria standardized the diagnosis of TLS, which was previously defined inconsistently across different oncology trials.

Last Comprehensive Review: 2026

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