HPV-16 Vaccination and Pembrolizumab Plus Cisplatin for "Intermediate Risk" HPV-16-associated Head and Neck Squamous Cell Carcinoma

Phase II Study Evaluating HPV-16 Vaccination (ISA101b) and Pembrolizumab Plus Cisplatin Chemoradiotherapy for "Intermediate Risk" HPV-16 Associated Head and Neck Squamous Cell Carcinoma (HNSCC)

This clinical trial will evaluate a new combination of pembrolizumab, HPV-16 E6/E7 specific therapeutic vaccination (ISA101b) and cisplatin-based chemoradiotherapy for patients with newly diagnosed, local-regionally advanced, intermediate risk HPV-associated head and neck squamous cell carcinoma.

Study Overview

• Status: Completed
• Conditions: Head and Neck Squamous Cell Carcinoma; HPV-Related Squamous Cell Carcinoma
• Intervention / Treatment: Drug: Cisplatin; Radiation: IMRT (Intensity Modulated Radiotherapy); Drug: Pembrolizumab; Biological: ISA101b

Detailed Description

This study aims to enroll adult male and female patients who have intermediate risk disease with histologically-confirmed head and neck squamous cell carcinoma (HNSCC) with no evidence of distant metastasis. All patients will receive the same treatment and there is no active control group.

In this trial, patients will undergo biopsy followed by treatment with the ISA101b vaccine which targets human papillomavirus (HPV). The vaccine treatment will begin 2 weeks prior to cisplatin and Intensity-Modulated Radiation Therapy (cisplatin-IMRT) and one week prior to the first dose of pembrolizumab, an anti-cancer immunotherapy targeting PD-1. The vaccine will be administered 2 additional times at weeks 2 and 5. Pembrolizumab will be initiated 1 week prior to cisplatin-IMRT at the dose of 200 mg IV q3 weeks (+/- 3 days). Pembrolizumab will be continued concurrently through cisplatin-IMRT (weeks 3, 6 ), and continued for a 15 week maintenance period after completion of cisplatin-IMRT for a total pembrolizumab treatment period of 24 weeks (8 doses; 6 months).

The purpose of this study is to evaluate patient survival following this combination of treatments.

• Study Type: Interventional
• Enrollment (Actual): 18
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • Pennsylvania
    • Pittsburgh, Pennsylvania, United States, 15232
      • UPMC Hillman Cancer Center

Participation Criteria

Eligibility Criteria

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

Description

Inclusion Criteria:

• Histologically-confirmed head and neck squamous cell carcinoma with no evidence of distant metastasis, with a primary site being the oropharynx. Squamous cell carcinoma of unknown primary, metastatic to cervical lymph nodes - patients can enroll provided all other eligibility criteria are met.

• Patients must have intermediate risk disease.

  o Patients must meet one of the following criteria: Oropharynx: p16(+) PLUS HPV ISH(+) (DNA or RNA) AND one of the following; ≥ AND ≥ 10 pack-years tobacco exposure (see Tobacco Assessment Form, Appendix A)

• T4 or N2c/N3 disease irrespective of tobacco exposure
• Unknown primary: p16(+) PLUS HPV ISH(+) (DNA or RNA) AND one of the following
• ≥ N2a AND ≥ 10 pack-years tobacco exposure
• N2c/N3 disease irrespective of tobacco exposure

• Patients should be considered not a candidate for curative-intent surgery with diagnosis of AJCC 7th edition Stage III, IVa, or IVb disease.

  • Diagnostic simple palatine or lingual tonsillectomy is permitted, provided patient has RECIST-measurable nodal disease.
  • Patients with a second HNSCC primary tumor are eligible for this study, provided more than 2 years have elapsed since the first diagnosis of HNSCC, the original tumor was managed with surgery only (no adjuvant chemotherapy or radiotherapy), and has not recurred.
• Patients with simultaneous primaries are excluded, with the exception of patients with bilateral tonsil/base of tongue HPV+ cancers or patients with T1-2, N0, M0 differentiated thyroid carcinoma (resected or management deferred), who are eligible.

• No prior systemic (chemotherapy or biologic/molecular targeted therapy) or radiation treatment for head and neck cancer.

  • Patients may have received chemotherapy or radiation for a previous, curatively treated non-HNSCC malignancy, provided at least 2 years have elapsed.
  • Patients must be untreated with radiation above the clavicles.
• Patients with a history of curatively-treated non-HNSCC malignancy must be disease-free for at least 2 years except for excised and cured disease.
• The patient must undergo a mandatory research biopsy at baseline. There will be 2 other optional biopsies that the patient will be asked to consent to, the first is durking week 2 of pembrolizumab/ISA101b vaccination (prior to start of cisplatin-IMRT-this correlates to week (-)1), the second once will be during week 2 after the start of IMRT (this correlates to week 1).
• Eastern Cooperative Oncology Group (ECOG) Performance Status 0-1
• Age ≥ 18
• Patients must have measurable disease according to RECIST 1.1
• Patients must demonstrate adequate organ function
• Written informed consent must be obtained from all patients prior to study registration.
• Documentation of negative pregnancy within 10 days of treatment initiation.

Exclusion Criteria:

• Oral Cavity, Larynx, Hypopharynx or Nasopharyngeal primary site
• Current participation in or previous participation in a study of an investigational agent or using an investigational device within 4 weeks of the first dose of study treatment.
• Prior treatment with anti-HPV agents except prevention HPV vaccines
• History of severe allergic or anaphylactic reactions or hypersensitivity to recombinant proteins or excipients in the investigational agents (pembrolizumab and ISA101b
• Distant metastatic disease including CNS or leptomeningeal metastases is not allowed.
• Acquired Immune Deficiency Syndrome (AIDS).
• Received prior monoclonal antibody within 4 weeks prior to study Day 1 or who has not recovered (i.e. ≤ Grade 1 or at baseline) from adverse events due to agents administered more than 4 weeks earlier.
• History of second malignancy within 2 years prior to Study Day 1 (except for excised and cured non-melanoma skin cancer, carcinoma in situ of breast or cervix, superficial bladder cancer, or T1a or T1b prostate cancer comprising < 5% of resected tissue with normal prostate specific antigen (PSA) since resection).
• Active autoimmune disease requiring systemic treatment within the past 3 months or a documented history of clinically severe autoimmune disease, or a syndrome that requires systemic steroids or immunosuppressive agents.
• Acquired Immune Deficiency Syndrome (AIDS).
• Known active Hepatitis B (e.g., HBsAg reactive) or Hepatitis C (e.g., HCV RNA [qualitative] is detected).
• Received prior therapy with an anti-PD-1, anti-PD-L1, anti-PD-L2, anti-CD137, or anti-Cytotoxic T-lymphocyte-associated antigen-4 (CTLA-4) antibody (including ipilimumab or any other antibody or drug specifically targeting T-cell co-stimulation or checkpoint pathways).
• Significant pulmonary disease including pulmonary hypertension, history of (non-infectious) pneumonitis that required steroids, evidence of interstitial lung disease or active, non-infectious pneumonitis
• History or current evidence of any other medical or psychiatric condition, therapy, or laboratory abnormality not in the best interest of the trial or subject to participate, per the treating investigator.
• Peripheral neuropathy ≥ Grade 2
• Significant cardiovascular disease.
• Significant thrombotic or embolic events within 3 months prior to Study Day 1.
• Major surgery within 6 weeks prior to Study Day 1 (subjects must have completely recovered from any previous surgery prior to Study Day 1). Biopsy, diagnostic tonsillectomy, airway tumor debulking or excisional lymph node biopsy do not constitute major surgery.
• Active infection requiring antibiotics or antifungals within 7 days prior to first dose of study drug.
• Significant electrolyte imbalance prior to enrollment (note that patients may be supplemented to achieve acceptable electrolyte values):
• Pregnant or breastfeeding (due to potential for teratogenic or abortifacient effects).

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: IMRT + Pembrolizumab + Cisplatin + ISA101b; IMRT (Intensity Modulated Radiotherapy) of 70 Gy in 35 fractions over 7 weeks (5 fractions per week). Pembrolizumab will be administered at 200 mg (fixed dose) IV every 3 weeks (+/- 3 days), beginning beginning one week (week -1) prior to concurrent cisplatin-IMRT. Cisplatin will be administered at 100 mg/m2 IV on days 1(Week 0) and 22 (Week 3). ISA101b will be administered as three rounds of vaccination 3-4 weeks apart via two SC injections per vaccination round at 100ug/peptide, before pembrolizumab treatment. Vaccination #1 will be administered 1 week before pembrolizumab.

Drug: Cisplatin; Chemotherapy; Radiation: IMRT (Intensity Modulated Radiotherapy); Radiation therapy; Drug: Pembrolizumab; A potent and highly selective humanized monoclonal antibody (mAb) of the IgG4/kappa isotype designed to directly block the interaction between programmed cell death protein 1 (PD-1) and its ligands, PD-L1 and PD-L2.; Biological: ISA101b; ISA101b is a therapeutic cancer vaccine that induces specific immune responses to the oncogenic E6 and E7 antigens from HPV16.; Other Names: HPV-16 Vaccine

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Progression-free Survival (PFS) at 2 Years	The percentage of participants whose disease has to progressed per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 at 2 years. PFS will be calculated from treatment initiation to disease progression or death from any cause for 2 years. Per RECIST 1.1, Progressive Disease (PD): At least a 20% increase in the sum of diameters of target lesions, taking as reference the smallest sum on study (this includes the baseline sum if that is the smallest on study). In addition to the relative increase of 20%, the sum must also demonstrate an absolute increase of at least 5 mm. (Note: the appearance of one or more new lesions is also considered progression).	At 2 years

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Serious Adverse Events Related to Study Treatment	Number of patients who experienced Serious Adverse Events per Common Terminology Criteria for Adverse Events (CTCAE) v5.0 that are possibly, probably or definitely related to study treatment.	Up to 3 years

Collaborators and Investigators

• Sponsor: Dan Zandberg
• Collaborators: Merck Sharp & Dohme LLC; ISA Pharmaceuticals
• Investigators: Principal Investigator: Dan P Zandberg, MD, UPMC Hillman Cancer Center

Study record dates

Study Major Dates

• Study Start (Actual): July 6, 2020
• Primary Completion (Actual): March 12, 2025
• Study Completion (Actual): March 9, 2026

Study Registration Dates

• First Submitted: April 27, 2020
• First Submitted That Met QC Criteria: April 27, 2020
• First Posted (Actual): April 30, 2020

Study Record Updates

• Last Update Posted (Actual): May 13, 2026
• Last Update Submitted That Met QC Criteria: April 21, 2026
• Last Verified: April 1, 2026

More Information

Terms related to this study

• Keywords: Cisplatin; Pembrolizumab; Chemoradiotherapy; ISA101b; Head and Neck Squamous Cell Carcinoma (HNSCC); HPV-16-associated HNSCC
• Additional Relevant MeSH Terms: Neoplasms by Site; Neoplasms; Neoplasms by Histologic Type; Head and Neck Neoplasms; Neoplasms, Glandular and Epithelial; Carcinoma; Carcinoma, Squamous Cell; Squamous Cell Carcinoma of Head and Neck; Therapeutics; Inorganic Chemicals; Chlorine Compounds; Nitrogen Compounds; Platinum Compounds; Radiotherapy; Radiotherapy, Conformal; Radiotherapy, Computer-Assisted; Cisplatin; pembrolizumab; Radiotherapy, Intensity-Modulated
• Other Study ID Numbers: HCC 19-082

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