Modified Conditioning Regimen for CML-BP

Prospective, Single-Arm Study on the Efficacy of a Reduced-Toxicity Conditioning Regimen Containing Thiotepa and Melphalan for Patients With Blast Phase Chronic Myeloid Leukemia

Study on the Efficacy and Safety of a Reduced-Toxicity Conditioning Regimen Containing Thiotepa and Melphalan in Patients with Blast Phase Chronic Myeloid Leukemia

Study Overview

• Status: Not yet recruiting
• Conditions: HSCT; CML,Blast Phase
• Intervention / Treatment: Drug: Enrolled patients with blast-phase chronic myeloid leukemia received a reduced-toxicity conditioning regimen containing thiotepa, melphalan, and fludarabine prior to undergoing allogeneic hematopoie

• Study Type: Interventional
• Enrollment (Estimated): 40
• Phase: Phase 2

Contacts and Locations

• Study Contact: Name: Erlie Jiang; Phone Number: 022-23608569; Email: jiangerlie@ihcams.ac.cn

Participation Criteria

Eligibility Criteria

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

Description

Inclusion Criteria:

• (1) Confirmed diagnosis of blast-phase chronic myeloid leukemia, with diagnostic criteria referring to the 2020 Chinese Guidelines for Diagnosis and Treatment of Chronic Myeloid Leukemia.

Diagnostic criteria for chronic myeloid leukemia: Typical clinical manifestations combined with the presence of Philadelphia chromosome and/or BCR-ABL fusion gene positivity confirm the diagnosis.

Diagnostic criteria for blast phase:

1. Peripheral blood or bone marrow blasts ≥20%
2. Aggregates of blasts on bone marrow biopsy
3. Extramedullary blast cell infiltration (2) Age ≥18 years (3) Ability to provide self-signed informed consent (4) Must meet adequate organ function requirements:

Renal and hepatic function as follows:

AST, ALT and ALP <2× upper limit of normal (ULN) Total bilirubin <1.5× ULN Creatinine clearance >50 mL/min

Pancreatic function:

Serum amylase ≤1.5× ULN Serum lipase ≤1.5× ULN

Normal cardiac function:

Ejection fraction (EF) >60% Pulmonary artery systolic pressure ≤50 mmHg (5) HIV negative, HBV negative, HCV negative (6) Eastern Cooperative Oncology Group Performance Status (ECOG-PS) score of 0-2 (7) Signed informed consent must be obtained before study procedures begin. For subjects aged 18 years or older, informed consent shall be signed by the patient themselves or direct family members. Considering the patient's medical condition, if the patient's own signature is medically inadvisable, the informed consent shall be signed by a legal guardian or the patient's direct family member.

Exclusion Criteria:

• 1. (1) Patients with previous autologous or allogeneic stem cell transplantation; (2) Patients concurrently diagnosed with other malignant tumors; patients assessed by investigators as having concomitant diseases that severely endanger their life safety or affect their ability to complete this study; (3) Patients with psychiatric disorders or other medical conditions that cannot comply with the requirements of study treatment and monitoring; (4) Patients unable or unwilling to sign the consent form; (5) Pregnant or lactating women; (6) Patients assessed by investigators as ineligible due to other special circumstances.

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: modified conditioning regimen

Drug: Enrolled patients with blast-phase chronic myeloid leukemia received a reduced-toxicity conditioning regimen containing thiotepa, melphalan, and fludarabine prior to undergoing allogeneic hematopoie; This study is a prospective, interventional clinical trial recruiting patients with blast-phase chronic myeloid leukemia from the Stem Cell Transplantation Center of the Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences, with an anticipated enrollment of 40 cases. Enrolled patients are scheduled to receive a reduced-toxicity conditioning regimen containing thiotepa, melphalan, and fludarabine for allogeneic hematopoietic stem cell transplantation. Thiotepa 5mg/kg on days -8 and -7, melphalan 60mg/m2 on days -5 and -4, Flu 30mg/m2 from day -6 to day -2.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
overall survival, OS	2 year

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Relapse free survival, RFS		2 year
TRM	Treatment relater mortality	2 year
CIR	cumulative incidence of relapse	2 year
safety and toxicity of conditioning regimen	Evaluate the side effects and safety of the regimen, using Bearman score system	2 year

Collaborators and Investigators

• Sponsor: Institute of Hematology & Blood Diseases Hospital, China

Study record dates

Study Major Dates

• Study Start (Estimated): December 15, 2025
• Primary Completion (Estimated): September 14, 2029
• Study Completion (Estimated): September 14, 2029

Study Registration Dates

• First Submitted: September 25, 2025
• First Submitted That Met QC Criteria: November 21, 2025
• First Posted (Actual): December 2, 2025

Study Record Updates

• Last Update Posted (Actual): December 2, 2025
• Last Update Submitted That Met QC Criteria: November 21, 2025
• Last Verified: November 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Amino Acids, Peptides, and Proteins; Organic Chemicals; Hydrocarbons; Amino Acids; Nitrogen Mustard Compounds; Mustard Compounds; Hydrocarbons, Halogenated; Phenylalanine; Amino Acids, Aromatic; Amino Acids, Cyclic; Melphalan
• Other Study ID Numbers: IIT2025094

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