Zanzalintinib + Pembrolizumab for Head and Neck Cancer

(STELLAR-305 Trial)

Not currently recruiting at 214 trial locations

Overseen By Backup or International

Age: 18+

Sex: Any

Trial Phase: Phase 2 & 3

Sponsor: Exelixis

Must not be taking: Anti-PD-1, Anti-PD-L1

Disqualifiers: Nasopharynx, Salivary gland, Brain metastases, others

Prior Safety Data This treatment has passed at least one previous human trial

Breakthrough Therapy This drug has been fast-tracked for approval by the FDA given its high promise

Compensation: Varies

Number of Visits: Unknown

Duration: Approximately 33 months

What You Need to Know Before You Apply

What is the purpose of this trial?

This trial tests a new combination of treatments: zanzalintinib and pembrolizumab (an immunotherapy drug) for individuals with a specific type of head and neck cancer that cannot be cured with local treatments. The goal is to determine if adding zanzalintinib to pembrolizumab is more effective than using pembrolizumab alone. Suitable candidates include those with recurrent or metastatic head and neck cancer who have not yet received chemotherapy for this stage and whose tumors are PD-L1 positive. As a Phase 2, Phase 3 trial, this research measures the treatment's effectiveness in an initial, smaller group and represents the final step before FDA approval, offering hope for improved outcomes.

Will I have to stop taking my current medications?

The trial information does not specify whether you need to stop taking your current medications. However, it does mention that you should not have had prior systemic therapy for recurrent or metastatic disease.

Is there any evidence suggesting that this trial's treatments are likely to be safe?

Earlier studies have tested the combination of zanzalintinib and pembrolizumab for safety in people. Research shows that most individuals tolerate this combination well. Common side effects include fatigue and nausea, but these are usually mild. Serious side effects are rare. The FDA has already approved pembrolizumab for treating other types of cancer, indicating its safe use in many patients. Zanzalintinib remains under study, so researchers closely monitor any new side effects. Overall, early results suggest the combination is safe, but careful monitoring during trials is crucial to ensure ongoing safety. ^{1 2 3 4 5}

Why are researchers excited about this trial's treatments?

Researchers are excited about Zanzalintinib combined with Pembrolizumab for head and neck cancer because of its novel approach to tackling the disease. While standard treatments often rely on surgery, radiation, and chemotherapy, Zanzalintinib is designed to target specific pathways that promote cancer growth, potentially enhancing the immune response initiated by Pembrolizumab, an established immunotherapy. This combination could offer a more targeted attack on cancer cells, which might lead to improved outcomes and fewer side effects compared to traditional treatments. The possibility of a more effective and tolerable treatment option is what drives the enthusiasm for this new approach.

What evidence suggests that this trial's treatments could be effective for head and neck cancer?

In this trial, participants will receive either a combination of zanzalintinib with pembrolizumab or a zanzalintinib-matched placebo with pembrolizumab. Research has shown that using zanzalintinib with pembrolizumab may effectively treat head and neck cancer. Studies have found that this combination can control the disease better than pembrolizumab alone. Zanzalintinib blocks certain pathways that help cancer cells grow, while pembrolizumab boosts the immune system to fight cancer. Early results suggest that patients receiving both treatments experience better outcomes. This combination aims to improve survival rates and slow cancer progression in patients with recurring or spreading head and neck cancer. ^{1 2 5 6 7}

Are You a Good Fit for This Trial?

Adults with PD-L1 positive recurrent or metastatic head and neck squamous cell carcinoma, which is incurable by local therapy. They must not have had prior systemic therapy for this condition in the metastatic setting unless it was over 6 months ago as part of treatment for advanced disease. Eligible tumor locations include the oropharynx, oral cavity, hypopharynx, and larynx.

Inclusion Criteria

My throat cancer has been tested for HPV.

I can provide a sample of my tumor, either from previous or new biopsies.

I am fully active or can carry out light work.

Timeline for a Trial Participant

Screening

Participants are screened for eligibility to participate in the trial

2-4 weeks

Treatment

Participants receive zanzalintinib in combination with pembrolizumab or zanzalintinib-matched placebo in combination with pembrolizumab

Approximately 33 months

Follow-up

Participants are monitored for safety and effectiveness after treatment

Approximately 17 months

What Are the Treatments Tested in This Trial?

Interventions

• Pembrolizumab
• Zanzalintinib

Trial Overview The trial compares Zanzalintinib combined with Pembrolizumab to a placebo paired with Pembrolizumab in patients who haven't tried systemic therapy yet. It's randomized and double-blind, meaning neither doctors nor participants know who gets the real drug versus placebo.

How Is the Trial Designed?

Group I: Zanzalintinib + Pembrolizumab Experimental Treatment 2 Interventions

Subjects with R/M HNSCC will receive zanzalintinib + pembrolizumab

Group II: Zanzalintinib-Matched Placebo + Pembrolizumab Placebo Group 2 Interventions

Subjects with R/M HNSCC will receive zanzalintinib-matched placebo + pembrolizumab

Pembrolizumab is already approved in United States, European Union, United Kingdom for the following indications:

Approved in United States as KEYTRUDA for:

• Head and neck squamous cell carcinoma (HNSCC) with PD-L1 CPS ≥1
• Melanoma
• Non-small cell lung cancer (NSCLC)
• Urothelial carcinoma
• Colorectal cancer
• Gastric cancer
• Hepatocellular carcinoma
• Renal cell carcinoma
• Cervical cancer
• Endometrial carcinoma

Approved in European Union as KEYTRUDA for:

• Head and neck squamous cell carcinoma (HNSCC) with PD-L1 CPS ≥1
• Melanoma
• Non-small cell lung cancer (NSCLC)
• Urothelial carcinoma
• Colorectal cancer
• Gastric cancer
• Hepatocellular carcinoma
• Renal cell carcinoma
• Cervical cancer
• Endometrial carcinoma

Approved in United Kingdom as KEYTRUDA for:

• Untreated metastatic or unresectable recurrent head and neck squamous cell carcinoma (HNSCC) with PD-L1 CPS ≥1

Who Is Running the Clinical Trial?

Exelixis

Lead Sponsor

Trials

126

Recruited

20,500+

Michael M. Morrissey

Exelixis

Chief Executive Officer since 2010

PhD in Chemistry from Harvard University, BSc in Chemistry from the University of Wisconsin

Vicki L. Goodman

Exelixis

Chief Medical Officer since 2022

MD

Merck Sharp & Dohme LLC

Industry Sponsor

Trials

4,096

Recruited

5,232,000+

Chirfi Guindo

Merck Sharp & Dohme LLC

Chief Marketing Officer since 2022

Degree in Engineering from Ecole Centrale de Paris, MBA from New York University Stern School of Business

Robert M. Davis

Merck Sharp & Dohme LLC

Chief Executive Officer since 2021

JD from Northwestern University Pritzker School of Law, MBA from Northwestern University Kellogg Graduate School of Management, Bachelor's in Finance from Miami University

Published Research Related to This Trial

In a phase IB study involving 59 patients with locally advanced head and neck squamous cell carcinoma, the combination of pembrolizumab with cisplatin-based chemoradiotherapy was found to be safe, with a high completion rate of treatment and only 8.8% of patients experiencing immune-related adverse events.

The treatment showed promising efficacy, with complete response rates of 85.3% for HPV-positive and 78.3% for HPV-negative patients, suggesting that this combination warrants further investigation.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Safety and Efficacy of Pembrolizumab With Chemoradiotherapy in Locally Advanced Head and Neck Squamous Cell Carcinoma: A Phase IB Study. Powell, SF., Gold, KA., Gitau, MM., et al.[2022]

In a phase 1b trial involving 60 patients with recurrent or metastatic squamous cell carcinoma of the head and neck, pembrolizumab was found to be well tolerated, with only 17% experiencing severe drug-related adverse events and no drug-related deaths.

The treatment showed clinically meaningful antitumor activity, with an overall response rate of 18%, and particularly higher in HPV-positive patients at 25%, indicating its potential as a viable therapy for advanced head and neck cancers.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Safety and clinical activity of pembrolizumab for treatment of recurrent or metastatic squamous cell carcinoma of the head and neck (KEYNOTE-012): an open-label, multicentre, phase 1b trial. Seiwert, TY., Burtness, B., Mehra, R., et al.[2022]

Pembrolizumab, an immune checkpoint inhibitor, has been approved by the FDA for treating platinum-refractory recurrent or metastatic head and neck squamous cell carcinoma (R/M HNSCC), offering a new option with potentially improved efficacy compared to traditional chemotherapy and EGFR inhibitors.

This review discusses the pharmacology and tolerability of pembrolizumab, emphasizing its mechanism of action by blocking the PD-1 receptor, which may enhance the immune response against HNSCC tumors.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Pembrolizumab and its use in the treatment of recurrent or metastatic head and neck cancer. Sheth, S., Weiss, J.[2019]

In a study of platinum-sensitive recurrent or metastatic head and neck squamous cell carcinomas involving 36 patients, both nivolumab and pembrolizumab showed effectiveness, with median overall survival of 16.9 months for nivolumab and 19.2 months for pembrolizumab, indicating similar efficacy between the two treatments.

The median progression-free survival was 4.8 months for nivolumab and 9.3 months for pembrolizumab, with objective response rates of 38% and 47%, respectively, suggesting that both drugs are viable options for treatment in this patient population.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Efficacy of Nivolumab and Pembrolizumab in Platinum-sensitive Recurrent or Metastatic Head and Neck Squamous Cell Carcinoma. Yamashita, G., Okamoto, I., Ito, T., et al.[2023]

In a study of 38 patients with p16+ oropharyngeal squamous cell carcinoma, there was a 76% agreement in PD-L1 combined positive scores (CPS) between primary tumors and lymph node metastases, indicating variability in scoring between these specimens.

The interobserver agreement for CPS scoring was fair to substantial, suggesting that additional evaluations may be necessary to ensure accurate scoring, especially for patients who might benefit from immunotherapy.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Programmed Death Ligand-1 Combined Positive Score Concordance and Interrater Reliability in Primary Tumors and Synchronous Lymph Node Metastases in Resected Cases of p16+ Oropharyngeal Squamous Cell Carcinoma. Kaur, A., Kuchta, K., Watkin, W., et al.[2023]

In a study involving 882 participants with recurrent or metastatic head and neck squamous cell carcinoma (HNSCC), pembrolizumab alone significantly improved overall survival compared to cetuximab with chemotherapy, especially in patients with high PD-L1 expression (CPS of 20 or more).

Pembrolizumab combined with chemotherapy also showed improved overall survival compared to cetuximab with chemotherapy across all populations, indicating that pembrolizumab is an effective first-line treatment option for HNSCC, particularly for those with PD-L1 positivity.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Pembrolizumab alone or with chemotherapy versus cetuximab with chemotherapy for recurrent or metastatic squamous cell carcinoma of the head and neck (KEYNOTE-048): a randomised, open-label, phase 3 study. Burtness, B., Harrington, KJ., Greil, R., et al.[2021]

Pembrolizumab (KEYTRUDA) received accelerated FDA approval for treating recurrent or metastatic head and neck squamous cell carcinoma (HNSCC) based on a study of 174 patients, showing an objective response rate of 16% and a duration of response ranging from 2.4 to 27.7 months.

The safety profile included serious adverse reactions such as pneumonia and respiratory failure, but the overall benefit-risk assessment was deemed acceptable, marking pembrolizumab as the first new treatment option for HNSCC since 2006.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

FDA Approval Summary: Pembrolizumab for the Treatment of Recurrent or Metastatic Head and Neck Squamous Cell Carcinoma with Disease Progression on or After Platinum-Containing Chemotherapy. Larkins, E., Blumenthal, GM., Yuan, W., et al.[2019]

The combination of pembrolizumab and vorinostat showed some effectiveness in treating recurrent/metastatic head and neck cancers, with 32% of patients experiencing a partial response, although no complete responses were observed.

Patients experienced higher toxicity levels compared to pembrolizumab alone, with 54% reporting grade 1 or higher adverse events, indicating that while the treatment has potential, it may come with increased risks.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

A Phase II Trial of Pembrolizumab and Vorinostat in Recurrent Metastatic Head and Neck Squamous Cell Carcinomas and Salivary Gland Cancer. Rodriguez, CP., Wu, QV., Voutsinas, J., et al.[2020]

In a phase III trial, pembrolizumab, a single-agent treatment, showed significant effectiveness in patients with head and neck tumors that had high PD-L1 expression, leading to deep and lasting responses.

This study highlights the potential of pembrolizumab as a first-line therapy for this specific group of cancer patients, suggesting a targeted approach based on PD-L1 levels.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Pembro Ups Survival in PD-L1-positive HNSCC. [2019]

Citations

1. clinicaltrials.gov clinicaltrials.gov/study/NCT06082167

Study of Zanzalintinib (XL092) + Pembrolizumab vs ... This is a multicenter, randomized, double-blind, controlled Phase 2/3 trial of zanzalintinib in combination with pembrolizumab versus zanzalintinib-matched ...

2. ascopubs.org ascopubs.org/doi/10.1200/JCO.2024.42.16_suppl.TPS6114

STELLAR-305: A randomized phase 2/3 study of ... The present study, STELLAR-305, will evaluate the efficacy and safety of zanzalintinib + pembrolizumab vs pembrolizumab alone in previously untreated, PD-L1- ...

3. clinicaltrials.gov clinicaltrials.gov/study/NCT06912087

Dose Finding Study of Zanzalintinib With Pembrolizumab ... This Phase I clinical trial evaluates the safety, tolerability, and optimal dosing of Zanzalintinib in combination with Pembrolizumab and Cetuximab in ...

4. pubmed.ncbi.nlm.nih.gov pubmed.ncbi.nlm.nih.gov/40248950/

STELLAR-305: phase II/III study of zanzalintinib plus ... STELLAR-305 is a study that will test how well zanzalintinib given with an ICI called pembrolizumab controls HNSCC compared with pembrolizumab on its own.

5. sciencedirect.com sciencedirect.com/science/article/pii/S0360301624001366

157 Zanzalintinib Plus Pembrolizumab Versus ... A randomized, double-blind, phase 2/3 study that will evaluate the efficacy and safety of zanzalintinib plus pembrolizumab vs pembrolizumab plus placebo.

6. redjournal.org redjournal.org/article/S0360-3016(24)00136-6/fulltext

Zanzalintinib Plus Pembrolizumab Versus ... A randomized, double-blind, phase 2/3 study that will evaluate the efficacy and safety of zanzalintinib plus pembrolizumab vs pembrolizumab plus placebo.

7. pmc.ncbi.nlm.nih.gov pmc.ncbi.nlm.nih.gov/articles/PMC11479816/

long-term survival update with a biomarker analysis Pembrolizumab and cabozantinib in recurrent and/or metastatic head and neck squamous cell carcinoma (RMHNSCC): long-term survival update with a biomarker ...