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The Clinical Implications of Immune Checkpoint Pathways in PCNSL

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT04158128
Recruitment Status : Recruiting
First Posted : November 8, 2019
Last Update Posted : June 18, 2021
Information provided by (Responsible Party):
National Taiwan University Hospital

Brief Summary:

Central nervous system lymphoma (CNSL) is a rare brain tumor constituting 3% of all newly diagnosed brain tumors, and 2% to 3% of all cases of non-Hodgkin lymphoma. There are two subtypes of CNSL. Owing to its low incidence, there is limited prospective and/or randomized data to guide the therapy of CNSL. Current knowledge about optimal diagnostic, prognostic and therapeutic strategies of CNSL is urged.

The immune system plays a fundamental role in controlling and eradicating cancer but is held in check by inhibitory receptors and ligands. These immune checkpoint pathways, which normally maintain self-tolerance and limit collateral tissue damage during anti-microbial immune responses, can be co-opted by cancer to evade immune destruction. A plethora of regulatory molecules have been identified. Among them, three have been studied most intensively: cytotoxic T lymphocyte antigen 4 (CTLA4) binding to CD80 or CD86, programmed cell death protein 1 (PD-1) binding to PD-1 ligand 1 (PD-L1) or PD-L2, and SIRPαbinding to CD47. Agents inhibiting CTLA-4, PD1, PD-L1 and CD47 are showing compelling antitumor activity in several solid and hematological cancers. Exploring the role of immune checkpoint pathways in CNSL may help us to establish the rational targeted therapies.

In this study, the investigators will investigate the protein expression of several specific molecules in immune checkpoint pathways such as PD-L1, PD-L2 and CD47 in the large neurological resection specimens by immunohistochemical staining of patients with CNSL. Besides, the concentrations of above molecules and other prognostic relevant factors such as chemokine CXCL13, Interleukin-10 and soluble CD19 in the cerebrospinal fluid (CSF) at initial diagnosis and after treatment will be evaluated using enzyme-linked immunosorbent assays. About 100 patients with CNSL will be recruited. The protein expression of the above molecules will be correlated with the clinical outcome of patients with CNSL. The feasibility of adopting these CSF molecules as useful diagnostic or prognostic biomarkers in CNSL will also be investigated.

Condition or disease Intervention/treatment
Lymphoma, B-Cell Other: non-intervention

Detailed Description:

Goal The goal and purpose of this study is to investigate the clinical implications and functional roles of immune checkpoint pathways in CNSL.

There are two specific aims:

  1. The adoption of protein expression of immune checkpoint pathways (CTLA-4, PD-L1, PD-L2, CD47) as a prognostic factor in patients with PCNSL. To fulfill this aim, the protein expression of CTLA-4, PD-L1, PD-L2, and CD47 in the neurosurgical resection specimens of patients with PCNSL will be evaluated by immunohistochemistry (IHC) techniques. The results will be correlated with clinical features and outcome of the patients with CNSL. Once parameters for these tissues are established it will be possible to speculate about the tumor grade, survival and response to treatment of these patients.
  2. The feasibility of adopting CSF CTLA-4, PD-L1, PD-L2, and sCD47 as useful diagnostic and prognostic biomarkers in patients with CNSL. To fulfill this aim, the concentrations of CSF CTLA-4, PD-L1, PD-L2 and sCD47 will be evaluated at the timings of initial diagnosis and after each cycle of systemic chemotherapy by enzyme-linked immunosorbent assays (ELISAs). The concentrations of these CSF molecules at initial diagnosis will be correlated with the prognosis of patients with CNSL. Besides, the investigators will compare the serial follow-up concentrations of these markers after each cycle of systemic chemotherapy to find out whether the presence of decreased concentrations will response to therapy.

This may help to discovery new diagnostic, prognostic and potential therapeutic strategies for patients with CNSL.

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Study Type : Observational [Patient Registry]
Estimated Enrollment : 100 participants
Observational Model: Cohort
Time Perspective: Other
Target Follow-Up Duration: 5 Years
Official Title: The Clinical Implications and Functional Roles of Immune Checkpoint Pathways in Primary Central Nervous System Lymphomas
Actual Study Start Date : October 27, 2016
Estimated Primary Completion Date : December 31, 2021
Estimated Study Completion Date : December 31, 2022

Intervention Details:
  • Other: non-intervention
    non-interventional, prospective cohort study

Primary Outcome Measures :
  1. Overall survival (OS) [ Time Frame: 5 years ]
    OS was measured from the date of the first diagnosis to the end of the follow-up period, death from any cause, or the date of the last known follow-up examination.

Secondary Outcome Measures :
  1. Progression-free survival (PFS) [ Time Frame: 5 years ]
    PFS was measured from the date of the first diagnosis until the end of the follow-up period, the date of relapse or progressive disease, death from any cause, or the last known follow-up examination, whichever came first.

  2. Treatment response [ Time Frame: 1 year ]
    Tumor responses were assessed through brain MRI or CT in all patients after two or three cycles of chemotherapy as well as at treatment completion.

Information from the National Library of Medicine

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Ages Eligible for Study:   20 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patients with newly diagnosed PCNSL at National Taiwan University Hospital from January 1996 to December 2020

Inclusion Criteria:

  • 1. Patients with newly diagnosed PCNSL at National Taiwan University Hospital from January 1996 to December 2020
  • 2. Patients aged 20 years and older

Exclusion Criteria:

  • 1. Subjects who are involved in any interventional treatment that might change experimental biomarkers, such as PD-L1 inhibitor, PD-1 inhibitor, anti CTLA-4 agents…etc before tumor and CSF sampling.
  • 2. Pregnancy or breast-feeding

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT04158128

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Contact: Chieh-Lung Cheng, Dr +886972651893

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National Taiwan University Hospital Recruiting
Taipei, Taiwan, 100
Contact: Chieh-Lung Cheng, Dr         
Sponsors and Collaborators
National Taiwan University Hospital
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Principal Investigator: Chieh-Lung Cheng, Dr NTUH
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Responsible Party: National Taiwan University Hospital Identifier: NCT04158128    
Other Study ID Numbers: 201608069RINB
First Posted: November 8, 2019    Key Record Dates
Last Update Posted: June 18, 2021
Last Verified: February 2021
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Lymphoma, B-Cell
Neoplasms by Histologic Type
Lymphoproliferative Disorders
Lymphatic Diseases
Immunoproliferative Disorders
Immune System Diseases
Lymphoma, Non-Hodgkin