Adjusted High-dose Chemotherapy with Autologous Stem Cell Transplant Vs. Conventional Immunochemotherapy in Elderly PCNSL Patients (PRIMA-CNS)

February 11, 2025 updated by: Elisabeth Schorb, University Hospital Freiburg

Age-adjusted High-dose Chemotherapy Followed by Autologous Stem Cell Transplantation or Conventional Chemotherapy with R-MP As First-line Treatment in Elderly Primary CNS Lymphoma Patients - a Randomized Phase III Trial

Most patients being diagnosed with primary diffuse large B-cell lymphoma of the central nervous system (PCNSL) are 60 years or older. Elderly patients with PCNSL have a poor prognosis and there is a great medical need to improve outcome for this vulnerable population. In Germany and many international centres, there are currently two widely used strategies to treat elderly PCNSL patients who are eligible for high-dose methotrexate (HD-MTX) treatment, which have not yet been compared head-to-head. The R-MP regimen has been established by the Cooperative PCNSL Study Group as a "conventional" immunochemotherapy standard treatment for elderly patients with newly diagnosed disease and consists of Rituximab, HD-MTX and Procarbazine followed by maintenance therapy with Procarbazine. In contrast, another recently established protocol also includes HD-MTX-based induction therapy, but followed by consolidating high-dose chemotherapy and autologous stem cell transplantation (HCT-ASCT). This is an overall more intensive, but substantially shorter treatment approach, feasible for elderly patients being considered eligible for a more intensive treatment. The PRIMA-CNS trial aims to compare these two treatment approaches with respect to survival, response rates and toxicity.

Study Overview

Detailed Description

Primary diffuse large B-cell lymphoma of the central nervous system (PCNSL) is a rare lymphoma affecting only the central nervous system compartment. PCNSL patients are typically 60 years or older and have poor prognoses. However, there are alternative treatment approaches to consider with the potential to improve medical outcomes for this patient population. The current standard of care in Germany and many international centres for patients 65 and older is treatment with R-MP, comprising rituximab, high-dose methotrexate (HD-MTX) and procarbazine followed by maintenance therapy with procarbazine. An alternative approach comprised of a shorter induction treatment with rituximab, HD-MTX and cytarabine (MARTA) followed by age-adjusted high-dose chemotherapy and autologous stem cell transplantation (HCT-ASCT) was recently shown to be feasible and effective in elderly PCNSL patients considered eligible for high-dose chemotherapy requiring autologous stem cell transplantation. Nevertheless, data evaluating this short duration treatment approach remains scarce, and randomized trials have not yet been published. The objective of the PRIMA-CNS trial is to demonstrate that intensified chemotherapy followed by consolidating HCT-ASCT is superior to conventional chemotherapy with R-MP followed by maintenance with procarbazine in elderly patients with newly diagnosed PCNSL; not only regarding survival and remission after treatment but also regarding standards like quality of life (QOL) and treatment related morbidities. Results of this randomized trial will either change the standard of care to an intense and shorter treatment approach or re-define R-MP as a proven treatment standard. In addition, a geriatric assessement is implemented in this trial with the goal to better define transplant eligibility. If this trial shows the superiority of HCT-ASCT, the investigators will establish an improved treatment standard with increased chances for long-term remission and cure and reduced frequency and length of chemotherapy treatment. Considering the poor prognosis of this patient population, this randomized phase III trial is of great clinical importance to provide patients, the patients' families and care takers with optimal treatment.

Study Type

Interventional

Enrollment (Estimated)

340

Phase

  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Immunocompetent patients with newly-diagnosed primary DLBCL of the central nervous system.
  2. Age > 70 years or age 65-70 years if not eligible for more intensive treatment (e.g. OptiMATe trial).
  3. Histologically or cytologically assessed diagnosis of B-cell lymphoma by local pathologist.
  4. Diagnostic sample obtained by stereotactic or surgical biopsy, cerebrospinal fluid (CSF) cytology examination or vitrectomy.
  5. Disease exclusively located in the CNS.
  6. At least 1 measurable lesion.
  7. Eastern Cooperative Oncology Group (ECOG)-Performance Status (PS) ≤ 2. ECOG PS > 2 accepted if due to PCNSL symptoms.
  8. Patients possibly eligible for HCT-ASCT as judged by the treating physician.
  9. Written informed consent obtained according to international guidelines and local laws by patient or authorized legal representative in case patient is temporarily legally not competent due to his or her disease.

Additional randomization criteria:

  1. Patients eligible for HCT-ASCT defined by the EBL score (at most one of the 3 following conditions may apply: ECOG PS > 1, Barthel Index of activities of daily living (ADL) < 20 and Lachs geriatric screening > 3), improvement of PS after pre-phase treatment or clinical judgement by the treating physician after discussion with the study expert team.
  2. No evidence of disease progression after pre-phase treatment.

Exclusion Criteria:

  1. Congenital or acquired immunodeficiency including HIV infection and previous organ transplantation.
  2. Systemic lymphoma manifestation (outside the CNS).
  3. Primary vitreoretinal lymphoma or primary leptomeningeal lymphoma without manifestation in the brain parenchyma or spinal cord.
  4. Previous or concurrent malignancies with the exception of surgically cured carcinoma in situ or other kinds of cancer without evidence of disease for at least 5 years.
  5. Previous systemic Non-Hodgkin lymphoma at any time.
  6. Inadequate renal function (creatinine clearance <60 ml/min).
  7. Inadequate bone marrow, cardiac, pulmonary or hepatic function according to investigator´s decision.
  8. Active hepatitis B or C disease.
  9. Concurrent treatment with other experimental drugs or participation in an interventional clinical trial with administration of study medication within the last thirty days before the start of this study.
  10. Third space fluid accumulation >500 ml.
  11. Hypersensitivity to study treatment or any component of the formulation.
  12. Taking any medications likely to cause interactions with the study medication.
  13. Known or persistent abuse of medication, drugs or alcohol.
  14. Active COVID-19-infection or non-compliance with the prevailing hygiene measures regarding the COVID-19 pandemic.
  15. Patients without legal capacity and who are unable to understand the nature, significance and consequences of the study and without designated legal representative.
  16. Previous participation in this trial.
  17. Persons who are in a relationship of dependency/employment to the sponsor and/ or investigator.
  18. Any familial, sociological or geographical condition potentially hampering compliance with the study protocol and follow-up schedule.
  19. Fertile patients refusing to use safe contraceptive methods during the study.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Arm A
Patients will receive 3 cycles (28 days cycle) of R-MP (Rituximab 375 mg/m² i.v. d0,14; MTX 3.5 g/m² i.v. d1,15; Procarbazine 60 mg/m²/d p.o. d2-11) followed by maintenance therapy with Procarbazine 100 mg absolute/d p.o. d1-5 for additional 6 cycles (28 days cycle).
Firstline systemic treatment with conventinal immunochemotherapy (3 cycles of Rituximab-MTX-Procarbazine) followed by Procarbazine maintenance
Experimental: Arm B
Patients will receive 2 cycles (21 days cycle) of R-MTX/AraC (Rituximab 375 mg/m² i.v. d0,4; MTX 3.5 g/m² i.v. d1; AraC 2x2 g/m² i.v. d2+d3) followed by consolidating HCT-ASCT with Rituximab 375 mg/m² d-8, Busulfan 3.2 mg/kg/d i.v. d-7 and d-6 and Thiotepa 5 mg/kg/d i.v. d-5 and d-4.
Firstline systemic treatment with age-adjusted MTX based induction (2 cycles of Rituximab-Methotrexate-Cytarabin) followed by consolidating aged-adapted high-dose chemotherapy and autologous stem cell transplantation

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Progression free survival (PFS) between the 2 arms
Time Frame: up to 6 years
PFS is defined as the time from randomization to disease progression or death of any cause, with censoring at the last date the patient was seen alive and free of disease progression
up to 6 years

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Overall survival (OS) between the 2 arms
Time Frame: up to 6 years
OS is defined as time from randomization until death from any cause, with censoring at the last date the patient was seen alive
up to 6 years
Event free survival (EFS) between the 2 arms
Time Frame: up to 6 years
EFS, defined as time from randomization to premature end of treatment (EOT) due to any reason, lymphoma progression or death, whichever occurs first, with censoring at the last date the patient was seen event-free
up to 6 years
Remission status after 2 cycles of rituximab-methotrexate-procarbazine (R-MP) (arm A)/2 cycles of R-MTX/cytarabine (AraC)
Time Frame: at RA I: after 8 weeks (Arm A), after 6 weeks (Arm B)
Remission status after 2 cycles of RMP (arm A) / 2 cycles of R-MTX/AraC will be determined at response assessment (RA) I in both arms and will be divided in complete remission (CR), unconfirmed complete remission (CRu), partial remission (PR), stable disease (SD), progressive disease(PD) according to international PCNSL collaborative group (IPCG) criteria
at RA I: after 8 weeks (Arm A), after 6 weeks (Arm B)
Remission status after 3 cycles of R-MP (arm A)/consolidating HCT-ASCT (arm B)
Time Frame: at RA II: after 12 weeks
determined at response assessment (RA) II and will be divided in CR, CRu, PR, SD, PD according to IPCG criteria
at RA II: after 12 weeks
Remission status after completion of maintenance treatment (arm A)/6 months follow-up (arm B)
Time Frame: 6 months after RA II
will be determined 6 months after RA II and will be divided in CR, CRu, PR, SD, PD according to IPCG criteria
6 months after RA II
Quality of life (EORTC QLQ-C30)
Time Frame: from date of informed consent form (ICF) signature up to 6 years
EORTC quality of life questionnaire (QLQ)-C30 performed at screening, at RA II /premature EOT and thereafter every 12 months during follow-up
from date of informed consent form (ICF) signature up to 6 years
Quality of Life (EORTC-QLQ BN 20)
Time Frame: from date of informed consent form (ICF) signature up to 6 years
EORTC-QLQ brain neoplasm (BN) 20, performed at screening, at RA II /premature EOT and thereafter every 12 months during follow-up
from date of informed consent form (ICF) signature up to 6 years

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
Safety: Toxicity
Time Frame: from date of informed consent form (ICF) signature until 30 days after end of treatment
Incidence of (Serious) adverse events ((S)AE) as assessed by CTCAE v5.0
from date of informed consent form (ICF) signature until 30 days after end of treatment
Safety: Neurotoxicity
Time Frame: from date of informed consent form (ICF) signature up to 6 years
Results in the following neuropsychological tests: Montreal Cognitive Assessment (MoCA), Trail Making Test A and B, the Rey-Osterrieth-Complex-Figure-Test and a verbal fluency test, performed at screening, RA II / premature EOT and every 12 months during follow-up.
from date of informed consent form (ICF) signature up to 6 years
Unplanned hospital admissions
Time Frame: from date of informed consent form (ICF) signature until 30 days after ASCT or 30 days after last administration of investigational medicinal products (IMP)
Defined as in-patient hospitalization due to SAE from date of informed consent form (ICF) signature until 30 days after ASCT or day 30 after last administration of IMP, whatever occurs first. Each hospitalization will be counted as a single event.
from date of informed consent form (ICF) signature until 30 days after ASCT or 30 days after last administration of investigational medicinal products (IMP)
Length of hospital stays
Time Frame: from date of informed consent form (ICF) signature until 30 days after ASCT or day 30 after last administration of IMP
Measured as number of nights in hospital due to SAE as defined above, i.e. hospital stays from date of ICF signature until 30 days after ASCT or day 30 after last administration of IMP, whatever occurs first.
from date of informed consent form (ICF) signature until 30 days after ASCT or day 30 after last administration of IMP

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

August 9, 2023

Primary Completion (Estimated)

August 31, 2029

Study Completion (Estimated)

August 31, 2031

Study Registration Dates

First Submitted

June 5, 2023

First Submitted That Met QC Criteria

February 11, 2025

First Posted (Actual)

March 25, 2025

Study Record Updates

Last Update Posted (Actual)

March 25, 2025

Last Update Submitted That Met QC Criteria

February 11, 2025

Last Verified

October 1, 2024

More Information

Terms related to this study

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Publication of study protocol and publication of study results

IPD Sharing Time Frame

year 2023 and after completion of study

IPD Sharing Access Criteria

Isbell LK et al. Age-adjusted high-dose chemotherapy followed by autologous stem cell transplantation or conventional chemotherapy with R-MP as first-line treatment in elderly primary CNS lymphoma patients - the randomized phase III PRIMA-CNS trial. BMC Cancer. 2023 Aug 18;23(1):767.

doi: 10.1186/s12885-023-11193-7. PMID: 37596517; PMCID: PMC10436648.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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