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Tear Fluid for the Detection of Tumor-associated Extracellular Vesicles in Glioblastoma Patients

17. august 2026 opdateret af: City of Hope Medical Center

Molecular Analysis of Tear Fluid Collected From Glioblastoma Patients: A Two-Phased Pilot Study

This clinical trial tests the impact of tear fluid in detecting tumor-associated extracellular vesicles (TEVs) in patients with glioblastoma. Brain tumors release small particles, called TEVs, that may provide information about the tumor, including how it responds to treatment. These particles can be found in cerebrospinal fluid (CSF), which is the fluid that surrounds the brain and spinal cord. Collecting CSF can be difficult and expensive, especially if samples are needed frequently to track these particles over time. Tear fluid is easier to collect than spinal fluid. If tears are found to contain similar tumor-related particles, changes in the tumor may be tracked by studying the particles found in tear fluid.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

PRIMARY OBJECTIVE:

I. To assess the feasibility of tear collection from healthy control and glioblastoma (GBM) patients (Phase 1 and 2).

SECONDARY OBJECTIVES:

I. To assess the feasibility of isolating and analyzing tumor-associated extracellular vesicles (TEVs) from tears of GBM patients (Phase 1 and 2).

II. To characterize the composition of tear-derived extracellular vesicles (EVs).

EXPLORATORY OBJECTIVES:

I. To compare EV profiles between patients with GBM and healthy control participants (Phase 1 and 2).

II. To explore longitudinal changes in EV profiles of patients from tears, CSF and plasma (Phase 2), and their association with clinical disease status, including radiographic response and recurrence.

III. To explore concordance between EV profiles and matched tumor molecular pathology as determined by HopeSeq analysis (Phase 2).

OUTLINE: Patients are assigned to 1 of 2 phases.

PHASE 1: Patients and healthy controls undergo collection of tears on study.

PHASE 2: Patients and healthy controls undergo collection of tears and blood samples and patients undergo collection of standard of care CSF samples throughout the study.

After completion of study intervention, patients are followed for up to 2 years.

Undersøgelsestype

Interventionel

Tilmelding (Anslået)

30

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

    • California
      • Duarte, California, Forenede Stater, 91010
        • City of Hope Medical Center
        • Ledende efterforsker:
          • Lisa A. Feldman
        • Kontakt:

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Voksen
  • Ældre voksen

Tager imod sunde frivillige

Ja

Beskrivelse

Inclusion Criteria:

  • Adults (age ≥ 18)
  • Male and female
  • All racial and ethnic groups
  • Pathologically-proven diagnosis of GBM or healthy volunteers
  • For GBM patients, presence of a previously placed Rickham reservoir or shunt
  • Able to provide informed consent (or via legal representative)
  • Willing to undergo Schirmer strip procedure

Exclusion Criteria:

  • Active ocular infection or inflammation
  • Recent ocular surgery (within 3 months)
  • Chronic dry eyes
  • Known allergy or hypersensitivity to topical anesthetics
  • Cognitive impairment
  • Pregnancy
  • Any condition that, in the opinion of the investigator, would interfere with the participant's ability to comply with study procedures or place the participant at undue risk

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Diagnostisk
  • Tildeling: Ikke-randomiseret
  • Interventionel model: Sekventiel tildeling
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Phase 1 (collection of tears)
Patients and healthy controls undergo collection of tears on study.
Hjælpestudier
Hjælpestudier
Undergo collection of tears
Andre navne:
  • Biologisk prøvesamling
  • Bioprøve indsamlet
  • Prøvesamling
  • Prøvekollektion
Undergo collection of blood and standard of care CSF samples
Andre navne:
  • Biologisk prøvesamling
  • Bioprøve indsamlet
  • Prøvesamling
  • Prøvekollektion
Eksperimentel: Phase 2 (collection of tears, blood, CSF)
Patients and healthy controls undergo collection of tears and blood samples and patients undergo collection of standard of care CSF samples throughout the study.
Hjælpestudier
Hjælpestudier
Undergo collection of tears
Andre navne:
  • Biologisk prøvesamling
  • Bioprøve indsamlet
  • Prøvesamling
  • Prøvekollektion
Undergo collection of blood and standard of care CSF samples
Andre navne:
  • Biologisk prøvesamling
  • Bioprøve indsamlet
  • Prøvesamling
  • Prøvekollektion

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Proportion of samples containing at least 2 uL of tear (feasibility)
Tidsramme: Up to 2 years
An exact two-sided 95% confidence interval will be provided as a measure of precision. P-values and confidence intervals will be interpreted descriptively.
Up to 2 years

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Quality and integrity of tear-derived extracellular vesicles (EVs)
Tidsramme: Up to 2 years
Will be assessed by the ability to generate interpretable SEVEN imaging data with acceptable signal-to-noise characteristics and vesicle morphology consistent with intact vesicles. Assay linearity will be evaluated using a dilution series.
Up to 2 years
Successful detection and quantification of tear-derived tumor-associated EVs (TEVs)
Tidsramme: Up to 2 years
Will be evaluated using the SEVEN platform, including measurable TEV abundance and detection of glioblastoma-associated markers. Assay linearity will be evaluated using a dilution series.
Up to 2 years
Characterization of the protein composition of tear-derived EVs
Tidsramme: Up to 2 years
Will include detection and relative quantification of central nervous system tumor-associated proteins using enzyme-linked immunosorbent assay. Will be descriptively summarized.
Up to 2 years
Detection of tumor-associated genetic and epigenetic alterations
Tidsramme: Up to 2 years
Will be determined by polymerase chain reaction-based sequencing methods within tear-derived EVs. Will be descriptively summarized.
Up to 2 years

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Samarbejdspartnere

Efterforskere

  • Ledende efterforsker: Lisa A Feldman, City of Hope Medical Center

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

9. december 2026

Primær færdiggørelse (Anslået)

19. september 2027

Studieafslutning (Anslået)

19. september 2027

Datoer for studieregistrering

Først indsendt

17. august 2026

Først indsendt, der opfyldte QC-kriterier

17. august 2026

Først opslået (Faktiske)

20. august 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

20. august 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

17. august 2026

Sidst verificeret

1. august 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 25617 (Anden identifikator: City of Hope Medical Center)
  • P30CA033572 (U.S. NIH-bevilling/kontrakt)
  • NCI-2026-05843 (Registry Identifier: CTRP (Clinical Trial Reporting Program))

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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