Timing of Renal Replacement Therapy Initiation in Tumor Lysis Syndrome

Inclusion Criteria: * Adults aged ≥18 years. * Hospitalized in the ICU between January 1, 2013, and December 31, 2023. * Diagnosed with a hematologic malignancy or solid tumor requiring chemotherapy. * Diagnosed with TLS based on the presence of two or more biochemical criteria (e.g., hyperkalemia, hyperphosphatemia, hyperuricemia, hypocalcemia) within 3 days before or 7 days after chemotherapy initiation. Exclusion Criteria: * Patient or family opposition to data collection for research purposes. * Incomplete medical records that preclude data extraction.