Dose-Reduced Consolidation Radiation Therapy in Patients With Diffuse Large B-cell Lymphoma

  • End date
    Nov 24, 2032
  • participants needed
  • sponsor
    Duke University
Updated on 24 January 2021
ct scan
platelet count
hodgkin's disease
neutrophil count
b-cell lymphoma
pet/ct scan
high grade b-cell lymphoma


This phase II study will evaluate whether a reduction in radiation dose and field size will maintain a high rate of local control while minimizing the risk of acute and late toxicity .

Hypothesis: The radiation dose and treatment volume can be safely reduced from 30 Gy to 20 Gy while maintaining high rates of local control in patients who had a negative PET-CT scan following rituximab - containing chemotherapy.


Chemotherapy followed by consolidation radiation therapy (RT) is a recognized treatment paradigm for DLBCL. This was initially established based on the results of 2 randomized trials conducted in the 1980s-1990s. In these studies patients were treated with 30Gy after chemotherapy (ECOG study) or 40-55Gy (SWOG study). A British National Lymphoma Investigation study showed no difference in freedom from local progression, progression-free survival or overall survival in between patients receiving 30Gy and 40-45Gy. Additionally systemic therapy for DLBCL has significantly improved since these initial studies, with the addition of rituximab to standard chemotherapy.

In a phase II study at Duke University patients with DLBCL NOS or primary mediastinal B-cell lymphoma were treated to 19.5-20Gy after achieving complete response to 4-6 cycles of chemotherapy containing rituximab. With a median follow-up of 43 months, there was only 1 local recurrence. The 5-year local control rate was 98%. Progression-free and overall survival at 5 years was 81% and 88%. Therefore, there is emerging evidence of long term favorable outcomes in localized DLBCL, while decreasing the risk of late effects by reducing the dose and volume of RT.

All participants will receive 20Gy instead of 30-36Gy after completion of at least 3 cycles of rituximab with combination chemotherapy. Participants must have a negative post chemotherapy PET-CT to participate in this study.

Condition Diffuse Large B-Cell Lymphoma, diffuse large cell lymphoma, diffuse large b cell lymphoma
Treatment radiation therapy
Clinical Study IdentifierNCT03681535
SponsorDuke University
Last Modified on24 January 2021


Yes No Not Sure

Inclusion Criteria

Is your age between 18 yrs and 80 yrs?
Gender: Male or Female
Do you have Diffuse Large B-Cell Lymphoma?
Do you have any of these conditions: diffuse large cell lymphoma or Diffuse Large B-Cell Lymphoma or diffuse large b cell lymphoma?
Histologic documentation of stage I-IV diffuse large B-cell lymphoma, not otherwise specified (DLBCL NOS), as defined by the 2016 WHO classification. This would include all entities within this category including germinal center B-cell and non-germinal center B-cell subtypes and those with a double expressor phenotype. Also eligible are stage I-IV high-grade B-cell lymphoma with MYC and BCL2 and/or BCL6 rearrangements and high-grade B-cell lymphoma, NOS
Completion of at least 3 cycles of rituximab-containing, anthracycline-based combination chemotherapy
Negative post-chemotherapy PET-CT scan or negative interim PET-CT scan performed within 2 weeks of the final cycle of chemoimmunotherapy. This is defined as a score of 1-3 on the PET Five Point (Deauville) Scale using the Modified Lugano Response Criteria for Non-Hodgkin's Lymphoma
Absolute neutrophil count greater than 1000 and platelet count greater than 40,000
Negative pregnancy test in women of child-bearing potential
Signed study specific informed consent

Exclusion Criteria

Primary central nervous system lymphoma, primary cutaneous DLBCL, leg type. T-cell/histiocyte-rich large B-cell lymphoma, primary mediastinal (thymic) large B-cell lymphoma, or other distinct non-Hodgkin lymphomas arising from large B-cells included in the WHO classification
Any absolute contraindications to irradiation
Clear my responses

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