Phase 2 Study of NAI, HPV Vaccine, and Nab-Paclitaxel in HPV-Positive Oropharyngeal Cancer Followed by De-Intensified Radiation Compared With Standard Chemoradiation

Open-Label, Single-Arm Phase 2 Study Of Nogapendekin Alfa Inbakicept, PD-L1 T-HaNK, And Bevacizumab And Randomized Phase 2B Study Of Nogapendekin Alfa Inbakicept, Bevacizumab, And Tumor Treatment Fields With Or Without PD-L1 T-HaNK In Participants With Recurrent Or Progressive Glioblastoma

This Phase 2a/2 study evaluates the safety, tolerability, and efficacy of neoadjuvant and adjuvant NAI, hAd5-HPV vaccine (IBRX-042), and nab-paclitaxel in participants with locally advanced HPV-positive oropharyngeal squamous cell carcinoma (OPSCC). The study includes a Phase 2a safety lead-in followed by a randomized Phase 2 comparison of a de-intensified experimental chemoradiation approach versus standard-of-care chemoradiation.

Study Overview

• Status: Not yet recruiting
• Conditions: Head and Neck Cancer; Oropharyngeal Squamous Cell Carcinoma; HPV-Positive Oropharyngeal Squamous Cell Carcinoma
• Intervention / Treatment: Drug: Nogapendekin Alfa Inbakicept (NAI); Biological: hAd5-HPV Vaccine (IBRX-042); Drug: Nab-Paclitaxel; Radiation: De-Intensified IMRT; Drug: Cisplatin; Radiation: Standard of Care IMRT

Detailed Description

This is a two-part study to evaluate the safety, tolerability, and efficacy of neoadjuvant and adjuvant therapy in participants with locally advanced HPV-positive oropharyngeal squamous cell carcinoma (OPSCC).

In part 1 (phase 2a), the first 10 eligible participants will be enrolled into a single-arm safety cohort and receive the experimental treatment regimen. This lead-in will assess safety, tolerability, and early biomarker response to the neoadjuvant combination.

All 10 participants in part 1 (phase 2a) receive the investigational therapy (NAI, IBRX-042, Nab-paclitaxel) followed by standard of care (SOC) radiation with concomitant cisplatin, and NAI and IBRX-042 post radiation.

The key primary objective in safety lead-in includes evaluating and confirming there are no unexpected severe adverse interactions between the combination agents. Early efficacy signals such as clearance of circulating tumor HPV DNA (using the NavDx® assay) will also be assessed to gauge biomarker response.

Upon successful completion of the safety lead-in (defined by acceptable safety profile and tolerability of the experimental regimen in the first 10 patients), part 2 (phase 2) will expand into an exploratory randomized trial, which will be a randomized 1:1 comparison between two arms, the experimental arm (arm A) and a SOC control arm (arm B).

Randomization will be stratified by tumor stage and smoking history to ensure balance between arms of important risk factors. This part of the study will evaluate comparative efficacy and safety outcomes between the de-intensified experimental approach and the standard chemoradiotherapy approach.

• Study Type: Interventional
• Enrollment (Estimated): 70
• Phase: Phase 2

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Age ≥ 18 years old.
2. Able to understand and provide a signed informed consent that fulfills the relevant Institutional Review Board (IRB) or Independent Ethics Committee (IEC) guidelines.
3. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
4. Histologically confirmed squamous cell carcinoma of the oropharynx that is HPV-positive (p16 immunohistochemistry positive and/or HPV DNA positive). Patients with cervical lymph node metastases from an unknown primary can be included if p16-positive and likely OPSCC origin.
5. Locally advanced, stage III/IV HPV-associated OPSCC that is a candidate for definitive chemoradiation. Specifically, tumors classified as T3 or T4 and/or node-positive disease (N2 or N3), without distant metastases (M0). Patients with very low-risk disease (e.g. T1-T2 N0-1) are excluded, as these might be handled with less intensive standard therapy or surgery rather than this trial approach.
6. No prior definitive treatment for the current OPSCC. Patients must be treatment-naïve with respect to chemotherapy, radiation, or investigational therapy for this cancer. Prior diagnostic biopsy is allowed, but no prior curative surgery or radiation to the head and neck.
7. Participants should be suitable for organ-preserving therapy (i.e., radiation) with no immediate need for surgical resection (the trial is non-surgical upfront).
8. Must be willing to accept the randomized treatment assignment after the safety lead-in. During the initial safety phase, all participants receive experimental therapy; once randomization begins, patients and investigators will not choose the arm - it will be assigned by the randomization schedule. Enrolled patients should have no clear contraindication to either arm's therapy (for instance, a patient who absolutely cannot receive cisplatin due to allergy or comorbidity might not be suitable, since cisplatin is required in both arms). The inclusion/exclusion criteria are structured to ensure a homogeneous population suitable for both the experimental approach and SOC chemoradiation.
9. Ability to attend required study visits and return for adequate follow-up, as required by this protocol.
10. Agreement to practice effective contraception for female participants of child-bearing potential and non-sterile males. Per cisplatin prescribing information, female participants of child-bearing potential must agree to use effective contraception for up to 14 months and non-sterile male participants must agree to use a condom for up to 11 months after last dose of cisplatin. Effective contraception includes surgical sterilization (eg, vasectomy, tubal ligation), orals, injectables, 2 forms of barrier methods (eg, condom, diaphragm) used with spermicide, intrauterine devices (IUDs), and hormonal therapy.

Exclusion Criteria:

1. HPV-negative or Non-OPSCC: Tumors that are p16-negative or not in the oropharynx are excluded.
2. Any evidence of distant metastases (M1 disease) excludes the patient, since the trial is for curative-intent local/regional therapy.
3. Previous radiation in the head/neck region or prior chemotherapy/immunotherapy for this cancer disqualifies the patient. We require a clean baseline to assess our regimen.
4. Active autoimmune disease or immunosuppression. The experimental arm includes immunotherapy (IL-15 receptor agonist and IBRX-042 vaccine), patients with active serious autoimmune disorders or those requiring immunosuppressive medications (e.g. chronic steroids >10 mg prednisone daily) are excluded to avoid severe immune-related complications. Well-controlled or mild autoimmune conditions may be considered on a case-by-case basis if risk is low.

5. Inadequate hematologic and end organ function, defined by the following laboratory results obtained within 14 days prior to baseline:

   1. Absolute neutrophil count (ANC) < 1,500 cells/μL without granulocyte colony-stimulating factor support
   2. Platelet count < 100,000/μL without transfusion

   3. Aspartate aminotransferase (AST), alanine aminotransferase (ALT), and alkaline phosphatase (ALP) > 2.5 × ULN, with the following exception:

      Participants with documented liver metastases: AST and/or ALT > 5 × ULN

   4. Serum bilirubin ≤ 3 × ULN
   5. Creatinine clearance ≤ 50 mL/min (calculated using the Cockcroft-Gault formula).
   6. Serum albumin < 3.0 g/dL.
6. Significant cardiovascular disease (such as New York Heart Association cardiac disease class II or greater), myocardial infarction within 3 months prior to baseline, unstable arrhythmias, or unstable angina.
7. Severe infections at the time of enrollment, including but not limited to hospitalization for complications of infection, bacteremia, or severe pneumonia.
8. History of human immunodeficiency virus (HIV) with current CD4+ T-cell count < 350 cells/μL and/or a detectable HIV viral load.
9. Any other diseases, metabolic dysfunction, physical examination finding, or clinical laboratory finding giving reasonable suspicion of a disease or condition that contraindicates the use of an investigational drug or that may affect the interpretation of the results or render the participant at high risk for treatment complications.
10. History of severe allergic, anaphylactic, or other hypersensitivity reactions to chimeric or humanized antibodies or fusion proteins.
11. Participation in an investigational drug study or history of receiving any investigational treatment within 30 days prior to the start of treatment on this study.
12. Assessed by the Investigator to be unable or unwilling to comply with the requirements of the protocol.
13. Pregnant and nursing women.

Study Plan

How is the study designed?

Design Details

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

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Phase 2a, Single Arm (Safety Lead-In); Participants will receive neoadjuvant nogapendekin alfa inbakicept (NAI), hAd5-HPV vaccine (IBRX-042), and nab-paclitaxel followed by de-intensified intensity-modulated radiation therapy (IMRT) with concurrent cisplatin, and post-radiation NAI and IBRX-042 during the Phase 2a safety lead-in portion of the study.	Drug: Nogapendekin Alfa Inbakicept (NAI); NAI 1.2 mg administered subcutaneously as part of the experimental treatment regimen.; Biological: hAd5-HPV Vaccine (IBRX-042); IBRX-042 administered subcutaneously as part of the experimental treatment regimen.; Drug: Nab-Paclitaxel; Nab-paclitaxel 100 mg/m² administered intravenously during neoadjuvant treatment cycles.; Radiation: De-Intensified IMRT; IMRT 40 Gy, delivered once daily, 5 days/week, over 4 weeks (20 total fractions)
Experimental: Arm A; Participants will receive neoadjuvant nogapendekin alfa inbakicept (NAI), hAd5-HPV vaccine (IBRX-042), and nab-paclitaxel followed by de-intensified intensity-modulated radiation therapy (IMRT) with concurrent cisplatin, and post-radiation NAI and IBRX-042.	Drug: Nogapendekin Alfa Inbakicept (NAI); NAI 1.2 mg administered subcutaneously as part of the experimental treatment regimen.; Biological: hAd5-HPV Vaccine (IBRX-042); IBRX-042 administered subcutaneously as part of the experimental treatment regimen.; Drug: Nab-Paclitaxel; Nab-paclitaxel 100 mg/m² administered intravenously during neoadjuvant treatment cycles.; Radiation: De-Intensified IMRT; IMRT 40 Gy, delivered once daily, 5 days/week, over 4 weeks (20 total fractions); Drug: Cisplatin; Cisplatin 40 mg/m² administered intravenously concurrently with radiation therapy.
Active Comparator: Arm B; Participants will receive standard-of-care intensity-modulated radiation therapy (IMRT) with concurrent cisplatin for locally advanced HPV-positive oropharyngeal squamous cell carcinoma (OPSCC).	Radiation: De-Intensified IMRT; IMRT 40 Gy, delivered once daily, 5 days/week, over 4 weeks (20 total fractions); Drug: Cisplatin; Cisplatin 40 mg/m² administered intravenously concurrently with radiation therapy.; Radiation: Standard of Care IMRT; SOC IMRT 70 Gy, delivered once daily, 5 days/week, over 7 weeks (35 total fractions)

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Progression-Free Survival (PFS)	Progression-free survival (PFS) as assessed by RECIST 1.1 criteria comparing the experimental treatment arm with the standard-of-care control arm in participants with locally advanced HPV-positive oropharyngeal squamous cell carcinoma (OPSCC).	Up to approximately 2 years after completion of treatment

Collaborators and Investigators

• Sponsor: ImmunityBio, Inc.

Study record dates

Study Major Dates

• Study Start (Estimated): July 22, 2026
• Primary Completion (Estimated): December 31, 2030
• Study Completion (Estimated): June 27, 2031

Study Registration Dates

• First Submitted: June 1, 2026
• First Submitted That Met QC Criteria: June 1, 2026
• First Posted (Actual): June 4, 2026

Study Record Updates

• Last Update Posted (Actual): June 4, 2026
• Last Update Submitted That Met QC Criteria: June 1, 2026
• Last Verified: May 1, 2026

More Information

Terms related to this study

• Keywords: Chemoradiation; Cisplatin; Neoadjuvant Therapy; Head and Neck Squamous Cell Carcinoma; Phase 2; HPV-16; Intensity-Modulated Radiation Therapy; Adjuvant Immunotherapy; ANKTIVA; Locally Advanced HPV-Positive OPSCC; Human Papillomavirus-Associated Oropharyngeal Cancer; Squamous Cell Carcinoma of the Oropharynx; De-Intensification Strategy; hAd5 HPV Vaccine; NavDx
• Additional Relevant MeSH Terms: Neoplasms by Site; Neoplasms; Neoplasms by Histologic Type; Neoplasms, Glandular and Epithelial; Carcinoma; Carcinoma, Squamous Cell; Squamous Cell Carcinoma of Head and Neck; Head and Neck Neoplasms; Inorganic Chemicals; Chlorine Compounds; Nitrogen Compounds; Platinum Compounds; Cisplatin; 130-nm albumin-bound paclitaxel
• Other Study ID Numbers: ResQ1190-HPV

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No