Reassessment of the Risk of Hemolytic Syndrome in Patients With Chronic Lymphocytic Leukemia Treated With a Regimen Containing Venetoclax (ELYSA)

Chronic lymphocytic leukemia is a malignant blood disorder characterized by the proliferation of abnormal B lymphocytes in the blood, lymph nodes, and bone marrow. It generally occurs after age 70 and is the fourth most common blood cancer in France, following multiple myeloma, diffuse large B-cell lymphoma, and myelodysplastic syndromes.

Treatments have advanced since 2015 with the introduction of immunotherapy and targeted therapies. The BCL2 inhibitor (venetoclax) is one of these innovative treatments. It is recommended as first-line therapy and for relapse in combination with anti-CD20 monoclonal antibodies and Bruton's tyrosine kinase inhibitors. Early studies showed that initial administration of venetoclax as monotherapy could lead to lysis syndrome as early as the first few days of treatment. This risk was correlated with the venetoclax dose and tumor burden. Prevention guidelines were subsequently proposed to guide management. This risk is therefore assessed before treatment begins (low, moderate, high), based on lymph node size and circulating lymphocyte count.

For patients at moderate and high risk, a treatment strategy is recommended that includes hyperhydration and uric acid-lowering agents, which may require hospitalization in some cases. The introduction of combination therapies has improved the depth and duration of response (obinutuzumab + venetoclax and ibrutinib + venetoclax). Venetoclax is added after the initiation of partner agents (22 days after obinutuzumab and 3 cycles after ibrutinib). This initial phase of treatment may reduce the risk of hemolytic syndrome. We propose here to reassess the risk of hemolytic syndrome before starting venetoclax in order to simplify management.

Study Overview

• Status: Not yet recruiting
• Conditions: Chronic Lymphoid Leukemia
• Intervention / Treatment: Procedure: Cervical, Thoracic, Abdominal, and Pelvic CT Scan

• Study Type: Interventional
• Enrollment (Estimated): 130
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Marion Mandon, PhD; Phone Number: +33 6 78 27 76 72; Email: mmandon@vivalto-sante.com

Study Locations

• France
  • Amiens, France
    • Clinique de l'Europe
    • Contact: Marion Mandon, PhD; Phone Number: +33 6 78 27 76 72; Email: drc@vivalto-sante.com
  • Nantes, France
    • Hopital Prive Du Confluent
    • Contact: Marion Mandon, PhD; Phone Number: +33 6 78 27 76 72; Email: drc@vivalto-sante.com

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Patients with chronic lymphocytic leukemia/lymphocytic lymphoma
• Meeting the treatment criteria according to iwCLL 2018
• Eligible for treatment with venetoclax in combination with a Bruton's tyrosine kinase inhibitor (ibrutinib, other approved generations) or obinutuzumab
• First-line treatment or relapse

Exclusion Criteria:

• Patients with meningeal and/or cerebral involvement
• Patients with an active, uncontrolled infection
• Patients scheduled to receive venetoclax monotherapy or rituximab-venetoclax according to the MURANO study regimen (Murano regimen: venetoclax is administered before rituximab)
• Contraindications to contrast-enhanced CT scanning (severe renal insufficiency, documented allergy to contrast agents).
• Pregnancy or breastfeeding
• Individuals deprived of their liberty, under legal guardianship, or under conservatorship
• Dementia, mental impairment, or psychiatric disorder that could compromise the patient's ability to provide informed consent and/or to adhere to the protocol and follow-up requirements of the trial

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: reassessment of risk of hemolytic syndrome	Procedure: Cervical, Thoracic, Abdominal, and Pelvic CT Scan; Cervical, Thoracic, Abdominal, and Pelvic CT Scan

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
risk level for tumor lysis syndrome	SLT is defined as any clinical and/or biological manifestation related to the destruction of tumor cells. It can be spontaneous (related to rapid disease progression, a rare occurrence in CLL) or treatment-induced. Clinical SLT may involve renal failure with decreased urine output and lower extremity edema, cardiac arrhythmias, fever, and seizures; its intensity may vary depending on severity. Biochemical SLT is defined by the presence of hyperkalemia, elevated serum creatinine levels, hyperuricemia, hyperphosphatemia, or hypocalcemia.	Basal - 7 days before introduction of Venetoclax

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Event-free survival	Event free survival defined as the time from the date of enrollment to the date of the first event of interest. The events of interest in the study are: treatment reduction or discontinuation, relapse or disease progression, death, and any grade ≥ 3 event.	From enrollment until the first event of interest, assessed up to 26 months.
Change from baseline in EORTC QLQ-CLL17 total score	Health-related quality of life will be assessed using the European Organisation for Research and Treatment of Cancer Chronic Lymphocytic Leukemia questionnaire (EORTC QLQ-CLL17). Scores are linearly transformed to a 0-100 scale. Higher symptom scores indicate greater symptom burden and therefore a worse outcome, whereas higher functioning scores indicate better functioning and therefore a better outcome.	Baseline, Month 3, Month 6, and end of treatment (up to 26 months).
Progression-free survival	Progression-free survival is defined as the time from enrollment to the first documented disease progression according to iwCLL criteria or death from any cause, whichever occurs first. Patients without progression or death will be censored at the date of their last disease assessment.	From enrollment until disease progression or death, assessed up to 26 months.
Overall Survival	Overall survival is defined as the time from enrollment to death from any cause. Patients who are alive at the time of analysis will be censored at the date of last known contact.	From enrollment until death from any cause, assessed up to 26 months.
Overall Response Rate	Overall response rate is defined as the proportion of patients achieving a complete response (CR) or partial response (PR) at the end of treatment according to International Workshop on Chronic Lymphocytic Leukemia (iwCLL) criteria.	End of treatment (up to 26 months).
Treatment Reduction or Discontinuation Rate	Proportion of patients with reduction or discontinuation of intravenous or oral treatment for any reason among the intention-to-treat population.	From treatment initiation to end of treatment (up to 26 months).

Collaborators and Investigators

• Sponsor: Private Hospital of Confluent, France

Study record dates

Study Major Dates

• Study Start (Estimated): July 31, 2026
• Primary Completion (Estimated): July 31, 2029
• Study Completion (Estimated): September 30, 2029

Study Registration Dates

• First Submitted: June 29, 2026
• First Submitted That Met QC Criteria: July 6, 2026
• First Posted (Actual): July 8, 2026

Study Record Updates

• Last Update Posted (Actual): July 8, 2026
• Last Update Submitted That Met QC Criteria: July 6, 2026
• Last Verified: July 1, 2026

More Information

Terms related to this study

• Keywords: venetoclax; chronic lymphoid leukemia; lysis syndrome
• Additional Relevant MeSH Terms: Neoplasms; Immune System Diseases; Neoplasms by Histologic Type; Hematologic Diseases; Lymphatic Diseases; Lymphoproliferative Disorders; Immunoproliferative Disorders; Leukemia, Lymphoid; Leukemia; Hemic and Lymphatic Diseases; Leukemia, B-Cell
• Other Study ID Numbers: 2025-50-HPC

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No