A Phase II Trial of Tadalafil in Patients With Squamous Cell Carcinoma of the Upper Aero Digestive Tract
Public ClinicalTrials.gov record NCT01697800. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
Head and neck squamous cell carcinoma (HNSCC) is a lethal solid malignancy with 5 year survival estimates of approximately 50%, and is associated with a high rate of systemic immune impairment as well as evasion of a tumor specific immune response. Preclinical and clinical data have shown that phosphodiesterase 5 (PDE5) inhibitors (tadalafil) can be used to augment immune function in HNSCC patients through inhibition of the cancer-induced myeloid derived suppressor cells (MDSCs). A multi site phase II, randomized, prospective, biomarker endpoint trial to determine optimum timing and design of PDE5 antitumor immunotherapy (tadalafil) in conjunction with conventional therapy for HNSCC. 40 patients with biopsy proven HNSCC will be randomized to receive tadalafil (n=25) or placebo (n=15) for at least 10-14 days before starting conventional therapy and continuing until 90 days after completion of conventional therapy. Tumor-specific T cell responses will be assessed using HNSCC cell lines, in blood collected before initiation of tadalafil/placebo and at 60 and 90 days after completion of conventional therapy. Number and function of MDSC and Treg cells will be assessed before and at 60 and 90 days after completion of conventional therapy. Prevnar 13® vaccine will be administered 10-14 days after commencing tadalafil/placebo (before conventional therapy begins) and again at 60 days after completion of conventional therapy. Vaccine-specific responses assessed at 60 and 90 days post-conventional therapy will be used to measure the ability of tadalafil to augment immune response to vaccine.
Study identification
- NCT ID
- NCT01697800
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Phase 2
- Enrollment
- 40 participants
Conditions and interventions
Conditions
Eligibility (public fields only)
- Age range
- 21 Years to 99 Years
- Sex
- All
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Aug 31, 2012
- Primary completion
- Jul 13, 2014
- Completion
- Jul 13, 2014
- Last update posted
- Feb 27, 2020
2012 – 2014
United States locations
- U.S. sites
- 1
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Johns Hopkins Hospital | Baltimore | Maryland | 21231 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT01697800, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Feb 27, 2020 · Synced Sep 1, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT01697800 live on ClinicalTrials.gov.