Multi Peptide Vaccination with XS15 in Addition to Standard Postoperative Radiation Therapy and Temozolomide Chemotherapy in Newly Diagnosed Glioblastoma (GLIO-XS15)

Multi Peptide Vaccination with Pam3Cys-GDPKHPKSF (XS15) As an Immunomodulator in Addition to Standard Postoperative Radiation Therapy and Temozolomide Chemotherapy in Newly Diagnosed HLA-A2-positive MGMT-methylated Glioblastoma

Newly diagnosed HLA-A2-positive MGMT-methylated glioblastoma patients will be vaccinated with a Multi peptide vaccination with Pam3Cys-GDPKHPKSF (XS15) as an immunomodulator in addition to standard postoperative radiation therapy and temozolomide chemotherapy to assess immunogenicity, efficacy, safety of the combination of multipeptide vaccination and the immune modulator XS15 emulsified in Montanide ISA 51 VG

Study Overview

• Status: Completed
• Conditions: Glioblastoma Multiforme of Brain
• Intervention / Treatment: Drug: Multipeptide plus XS15

• Study Type: Interventional
• Enrollment (Actual): 15
• Phase: Phase 1

Contacts and Locations

Study Locations

• Germany
  • BW
    • Tübingen, BW, Germany, 72076
      • University Hospital Tübingen

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Subjects meeting all of the following criteria will be considered for admission to the trial:

For screening phase: (Consent C1)

1. .Must be ≥ 18 years at the time of signing the informed consent 2. Suspected Glioblastoma (presenting with a MRI suggestive of glioblastoma and eligible for gross or subtotal resection and standard radiotherapy with temozolomide) For Vaccination phase (Consent C2)

1. Histologically confirmed, newly diagnosed IDH1-wildtype glioblastoma (astrocytoma WHO grade IV)
2. MGMT gene promoter methylation
3. HLA phenotype HLA-A*02:01 (as determined by a PCR-based 4-digit typing method)
4. Gross or subtotal resection (20%, as determined by MRI)
5. Postoperative MRI
6. KPS ≥70%
7. Life expectancy > 6 months
8. Patient is a candidate for and willing to receive standard radiation therapy with TMZ followed by maintenance TMZ cycles
9. Patient is not on steroids or on stable or decreasing steroid levels not exceeding 2 mg/day dexamethasone (or equivalent doses of other steroids) during the last 3 days prior to first dose of IMP (Vaccination 1)
10. Absolute lymphocyte count (ALC) >0.5 x109/L (re-screening of lymphocyte counts is allowed at day of vaccination)
11. Ability of subject to understand and the willingness to sign written informed consent for study participation prior to any study related assessments/procedures. Able to adhere to the study visit schedule and other protocol requirements.

12. Female Patient of childbearing potential1 and male patients with female partner of childbearing potential1 is willing to use highly effective contraceptive methods during treatment and for 30 days after the end of treatment. According to the CTFG Recommendations highly effective contraceptive methods are:

    • combined hormonal contraceptive associated with inhibition of ovulation (oral,-intravaginal,-transdermal)
    • progestogen-only hormonal contraception associated with inhibition of ovulation (pral injectable, implantable)
    • intrauterine device (IUD)
    • intrauterine hormone-releasing system (IUS)
    • bilateral tubal occlusion,
    • vasectomized partner2,
    • sexual abstinence3.
13. Negative Covid 19 Quick Test
14. Female subjects must abstain from breastfeeding during study participation and 30 days after study drug discontinuation.
15. Male subjects must refrain from donating semen or sperm while on study
16. All subjects must agree to refrain from donating blood while on study drug and for 30 days after discontinuation from this study treatment.
17. All subjects must agree not to share medication.

Exclusion Criteria:

• Subjects presenting with any of the following criteria will not be included in the trial:

  1. Karnofsky performance score (KPS) < 70%
  2. Patient who cannot undergo MRI assessments
  3. Only Biopsy available
  4. Women during pregnancy and lactation.
  5. History of hypersensitivity to the investigational medicinal product or to any drug with similar chemical structure or to any excipient present in the pharmaceutical form of the investigational medicinal product.
  6. Participation in other clinical trials or observation period of competing trials.
  7. Platelet count decrease < 75 x109/L
  8. Bilirubin > 1.5 x ULN (upper limit of normal according to the performing lab's reference range)
  9. ALT4 > 3 x ULN
  10. AST5 > 3 x ULN
  11. GGT > 2.5 x ULN
  12. Serum creatinine increased > 1.5 x ULN
  13. HIV infection or active Hepatitis B or C infection, or active infections requiring oral or intravenous antibiotics or that can cause a severe disease and pose a severe danger to lab personnel working on patients' blood or tissue (e.g. rabies).
  14. Prior therapy for glioma (except surgery and steroids) including but not limited to carmustine wafers and immunotherapy. Note: History of low grade glioma that did not require prior treatment with chemotherapy or radiotherapy is not an exclusion criterion.
  15. Clinically relevant autoimmune diseases (with the exception of thyroid diseases).
  16. Immunosuppression, not related to prior treatment for malignancy, or prior drug reaction
  17. Other vaccinations with active or attenuated viruses should be restricted during the peptide vaccination period.
  18. Enzyme-inducing antiepileptic drugs
  19. Patients with prior stem cell transplantation or solid organ transplantation.
  20. Any condition that in the judgment of the investigator interferes with the probability that an individual patient may receive and benefit from APVAC vaccinations (e.g. high risk of early disease progression / recurrence; immunocompromised status; anticipated compliance problems)

  21. Serious illness or condition, which according to the investigator, poses an undue risk for the patient when participating in the trial, including, but not limited to, any of the following:

      • Clinically symptomatic cardiovascular disease:(New York Heart Association class III-IV congestive heart failure)
      • Symptomatic peripheral vascular disease (Definition z.B. > Stage III)
      • Severe pulmonary dysfunction (Definition: z.B. requirement for oxygen supplement
      • Severe diabetes
      • History of other malignancies (except for adequately treated basal or squamous cell carcinoma or carcinoma in situ) within the last 5 years unless the patient has been disease-free for 5 years

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Multipeptide plus XS15; The vaccine will be applied by subcutaneous injection into the abdominal skin of the study patient. Vaccination will take place monthly (V1, V2 and V3). A total of three vaccinations will be performed. Peptide vaccines should be injected into the skin at the lower part of the abdomen of the patients. The exact site of vaccination (right or left) will be determined at the time of first vaccination and should not be changed during subsequent vaccinations.

Drug: Multipeptide plus XS15; The vaccine will be applied by subcutaneous injection into the abdominal skin of the study patient. Vaccination will take place monthly (V1, V2 and V3). A total of three vaccinations will be performed. Peptide vaccines should be injected into the skin at the lower part of the abdomen of the patients. The exact site of vaccination (right or left) will be determined at the time of first vaccination and should not be changed during subsequent vaccinations.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Adevrse Events	The assessment of safety of the IMP will be accomplished by documentation of adverse events and grading according to CTCAE from first vaccination throughout the end of treatment, until 30 days after last vaccination.	at 12 months after last vaccination
Change of immunogenicity parameter from baselien	The assessment of immunogenicity is the central biological efficacy endpoint of the clinical trial. Measurements of the induction of T-cell response after vaccination at 30 days, 60 days and 90 days from first vaccination and at 12 months after last vaccinationcompared to baseline as determined by ELISpot	at 30 days, 60 days and 90 days from first vaccination and at 12 months after last vaccination

Collaborators and Investigators

• Sponsor: University Hospital Tuebingen
• Investigators: Principal Investigator: Ghazaleh Tabatabai, Prof, University Hospital Tuebingen

Study record dates

Study Major Dates

• Study Start (Actual): May 3, 2021
• Primary Completion (Actual): July 31, 2024
• Study Completion (Actual): July 31, 2024

Study Registration Dates

• First Submitted: March 1, 2021
• First Submitted That Met QC Criteria: April 12, 2021
• First Posted (Actual): April 13, 2021

Study Record Updates

• Last Update Posted (Actual): March 25, 2025
• Last Update Submitted That Met QC Criteria: January 8, 2025
• Last Verified: December 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Neoplasms; Neoplasms by Histologic Type; Neoplasms, Glandular and Epithelial; Astrocytoma; Glioma; Neoplasms, Neuroepithelial; Neuroectodermal Tumors; Neoplasms, Germ Cell and Embryonal; Neoplasms, Nerve Tissue; Glioblastoma
• Other Study ID Numbers: 2020-003357-30

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

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