Ultra-low-dose Radiation Therapy Followed by Orelabrutinib as First-line Treatment for Stage Ⅰ-Ⅱ MALT Lymphoma: A Prospective, Multicenter Phase Ⅱ Study

NCT07554898 | Recruiting Phase 2

• 1 other identifier: MALT-RO
• Study Type: interventional
• Target: 60
• Locations: 1 country
• Sites: 2

Brief Summary

This is a prospective, multicenter Phase 2 clinical trial named the MALT-RO study, evaluating ultra-low-dose radiation therapy followed by orelabrutinib as first-line treatment for adults with Stage I-II MALT lymphoma. The study aims to determine the efficacy and safety profile of this sequential regimen. Eligible participants aged 18 years or older with histologically confirmed MALT lymphoma, measurable lesions, no prior systemic anti-lymphoma therapy, adequate organ function, and an ECOG performance status of 0-1 will receive 4Gy ultra-low-dose radiation (2Gy daily for 2 consecutive days) followed by oral orelabrutinib 150mg once daily for up to 6 cycles (28 days per cycle). Patients with partial response or stable disease after 6 cycles may continue orelabrutinib monotherapy for up to 12 cycles or until disease progression. All participants will undergo regular safety monitoring, tumor assessments, and long-term follow-up every 3 months to evaluate treatment durability. This treatment strategy is designed to improve efficacy and achieve more favorable outcomes compared with standard approaches for MALT lymphoma, while minimizing treatment-related toxicities such as long-term organ damage, xerostomia, cataracts, and other complications related to conventional standard-dose radiation, thereby offering a well-tolerated, convenient, targeted therapeutic option for patients with MALT lymphoma under strict ethical oversight in accordance with the Declaration of Helsinki and Chinese Good Clinical Practice guidelines.

Conditions

MALT Lymphoma

Outcome Measures

Primary Outcomes (2)

• Complete Remission Rate (CRR)

  Complete remission is defined as the disappearance of all target lesions and no new lesions appearing, assessed per the Lugano Response Criteria for Lymphoma.

  Assessed at the end of the treatment (approximately 6 cycles, up to 6 months from study start) .

• Incidence of Adverse Events

  Safety outcomes include the incidence, severity, and relationship to treatment of all adverse events (AEs) and serious adverse events (SAEs) monitored throughout the treatment and follow-up period.

  Throughout the treatment period and during the follow-up period (up to 12 months or until disease progression).

Secondary Outcomes (5)

• Objective Response Rate (ORR)

  3-month, 6-month, and 12-month follow-up visits.

• Duration of Response (DOR)

  Assessed every 3 months up to 24 months after study initiation.

• Time to Response (TTR)

  Assessed at each on-treatment visit (every 4 weeks during 6 cycles of orelabrutinib) and follow-up visits.

• Progression-Free Survival (PFS)

  Assessed every 3 months up to 24 months after study initiation.

• Overall Survival (OS)

  24 months

Study Arms (1)

Ultra-low-dose Radiation Followed by Orelabrutinib

EXPERIMENTAL

All participants will receive a sequential treatment regimen: ultra-low-dose radiation therapy (total 4Gy, administered as 2Gy daily for 2 consecutive days), followed by oral orelabrutinib 150mg once daily for up to 6 cycles (28 days per cycle). Patients who achieve partial response or stable disease without disease progression after 6 cycles may continue orelabrutinib monotherapy for up to 12 cycles or until progression.

Drug: Orelabrutinib; Radiation: Ultra-low-dose Radiation Therapy

Interventions

Orelabrutinib DRUG

Orelabrutinib 150 mg tablets, administered orally once daily. Treatment consists of up to 6 consecutive 28-day cycles. Patients with partial response or stable disease without disease progression after 6 cycles may continue orelabrutinib monotherapy for up to 12 cycles.

Ultra-low-dose Radiation Followed by Orelabrutinib

Ultra-low-dose Radiation Therapy RADIATION

The total radiation dose is 4 Gy, administered as 2 Gy per day for 2 consecutive days.

Ultra-low-dose Radiation Followed by Orelabrutinib

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Age ≥ 18 years, all genders eligible;
• Histopathologically confirmed MALT lymphoma (extranodal marginal zone lymphoma) with at least one measurable lesion outside the spleen, with any diameter \> 1.0 cm;
• No prior systemic anti-tumor therapy after diagnosis (including chemotherapy, targeted therapy, rituximab, etc.).
• Note: For patients with primary gastric MALT lymphoma, Helicobacter pylori (HP) must be negative or the patient must have failed standard HP eradication therapy. Patients with MZL who progressed or relapsed after local treatment (including surgery, Helicobacter pylori eradication, and hepatitis C treatment) are eligible for enrollment.
• ECOG performance status score of 0-1;
• Presence of treatment indications as judged by the investigator (including symptoms, cytopenias, risk of end-organ damage, bulky disease, or persistent progression);
• Adequate major organ function, meeting the following criteria:
• Absolute neutrophil count (ANC) ≥ 1.5 × 10⁹/L, platelets ≥ 75 × 10⁹/L, hemoglobin ≥ 75 g/L; If bone marrow involvement is present: ANC ≥ 1.0 × 10⁹/L, platelets ≥ 50 × 10⁹/L, hemoglobin ≥ 50 g/L;
• Total bilirubin ≤ 1.5 × ULN, AST or ALT ≤ 2 × ULN, serum creatinine ≤ 1.5 × ULN, serum amylase ≤ ULN;
• International Normalized Ratio (INR) ≤ 1.5 × ULN.
• Expected survival ≥ 3 months;
• Voluntarily provide written informed consent before screening.

You may not qualify if:

• Current or history of other malignant tumors, except for those who have achieved complete remission after radical treatment;
• Lymphoma involvement of the central nervous system or transformation to high-grade lymphoma;
• Patients with other tumors who have not recovered from non-hematologic toxicities of prior anti-tumor therapy to ≤ Grade 1 (except for alopecia);
• Uncontrolled or significant cardiovascular diseases, including:
• Congestive heart failure of New York Heart Association (NYHA) Class II or above, unstable angina, myocardial infarction within 6 months before the first dose of the study drug, or arrhythmias requiring treatment at screening, or left ventricular ejection fraction (LVEF) \< 50%;
• Primary cardiomyopathy (e.g., dilated cardiomyopathy, hypertrophic cardiomyopathy, arrhythmogenic right ventricular cardiomyopathy, restrictive cardiomyopathy, or unclassified cardiomyopathy);
• History of clinically significant QTc interval prolongation, or QTc interval at screening \> 470 ms for females or \> 450 ms for males;
• Subjects with symptomatic coronary artery disease requiring medication;
• Uncontrolled hypertension (despite lifestyle modification and use of a reasonable and tolerable maximum dose of 3 or more antihypertensive drugs \[including diuretics\] for more than 1 month, blood pressure still not reaching target, or blood pressure can only be effectively controlled with 4 or more antihypertensive drugs);
• Active bleeding within 2 months before screening, or currently receiving anticoagulant drugs, or considered by the investigator to have a clear bleeding tendency;
• Urine protein ≥ 2+ and 24-hour urine protein quantification ≥ 2 g/24 hours;
• History of deep vein thrombosis or pulmonary embolism within the past 6 months;
• History of organ transplantation or allogeneic hematopoietic stem cell transplantation;
• HIV/AIDS or other serious infectious diseases;
• Patients with severe pulmonary function impairment due to pulmonary fibrosis, interstitial pneumonia, pneumoconiosis, radiation pneumonitis, drug-induced pneumonitis, or other conditions;

Sponsors & Collaborators

• Zhejiang Cancer Hospital: lead
• Second Affiliated Hospital, School of Medicine, Zhejiang University: collaborator
• First Affiliated Hospital of Zhejiang University: collaborator
• Zhejiang Provincial People's Hospital: collaborator
• Zhejiang Provincial Tongde Hospital: collaborator
• Changxing County Traditional Chinese Medicine Hospital: collaborator

Study Sites (2)

No. 1, East Banshan Road , Gongshu District

Hangzhou, Zhejiang, 310000, China

RECRUITING

The First Affiliated Hospital, Zhejiang University School of Medicine

Hangzhou, Zhejiang, 310000, China

RECRUITING

MeSH Terms

Conditions

Lymphoma, B-Cell, Marginal Zone

Interventions

orelabrutinib

Condition Hierarchy (Ancestors)

Lymphoma, B-Cell; Lymphoma, Non-Hodgkin; Lymphoma; Neoplasms by Histologic Type; Neoplasms; Lymphoproliferative Disorders; Lymphatic Diseases; Hemic and Lymphatic Diseases; Immunoproliferative Disorders; Immune System Diseases

Study Officials

• Yamin Tan, phD

  Zhejiang Cancer Hospital

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Xiaolin Yuan, MD

CONTACT

8657188122153; yuanxiaolinhaha@163.com

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Chief Physician

Model Details: Single-arm, open-label, non-controlled Phase 2 study. All participants receive the same sequential treatment: ultra-low-dose radiation followed by orelabrutinib, with no control group or blinding.

Study Record Dates

• First Submitted: April 21, 2026
• First Posted: April 28, 2026
• Study Start: April 16, 2026
• Primary Completion (Estimated): February 1, 2028
• Study Completion (Estimated): January 1, 2029
• Last Updated: April 28, 2026

Record last verified: 2026-04

Locations

CN (2)