Dissecting the Heterogeneity of Oral Cancer Pain

September 26, 2022 updated by: Brian L. Schmidt, NYU College of Dentistry

Oral squamous cell carcinoma (SCC) produces a higher prevalence and more severe pain than all other cancers. Orofacial pain is one of the most common initial symptoms of oral cancer and often leads to the diagnosis of oral cancer. However, the character, severity, and unique features of oral cancer widely differ between patients. There is currently no effective and lasting treatment available to alleviate suffering from oral cancer pain.

A significant obstacle to effectively treating cancer pain is that the relative contributions of nociceptive mediators and their mechanisms of action (i.e., responsible receptors) are largely unknown. There is, therefore, a critical need to define the neurobiologic mechanisms responsible for oral cancer pain. Without such information, the promise of non-opioid therapy for the treatment of oral cancer pain will remain unfulfilled.

The primary objective of this study is to define and quantify the phenotype of oral cancer pain in patients, by comparing mechano- and chemosensitivity in oral cancer patients with healthy subjects. Pain will be stimulated on the site of cancer in 40 oral cancer patients and on the tongue in 40 healthy volunteers utilizing chemical sensitivity and mechanical sensitivity tests.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

Oral squamous cell carcinoma (SCC) is the sixth most common cancer worldwide. The majority of patients with oral SCC suffer from severe, chronic, function-induced pain. Despite the severity of pain in many patients, the presentation of oral cancer pain is variable. Opioids are the only treatment available for oral cancer pain. Opioids are often ineffective and associated with tolerance, constipation, somnolence, respiratory depression, and addiction, which is now a national crisis.

The current hypothesis for the etiology of oral cancer pain, which is based on clinical studies utilizing questionnaires and preclinical studies, is that cancer cells and cells within the microenvironment produce mediators that activate and sensitize nociceptors. Published and preliminary data indicate that cancer-secreted mediators induce mechano- and chemosensitivity. For example, preliminary clinical studies demonstrate that oral cancer patients experience preoperative sensitivity to capsaicin (i.e., chemosensitivity) and report greater functional (i.e., mechanosensitivity) pain. Capsaicin activates transient receptor potential vanilloid 1 (TRPV1). TRPV1 is activated by temperatures above 43°C and endogenous lipid metabolic products. Mice deficient in TRPV1 respond to mechanical stimuli, suggesting that TRPV1 is not involved in the detection of mechanical stimulation. By contrast, TRP ankyrin repeat 1 (TRPA1), co-localized with TRPV1, is responsive to mechanical stimuli, in addition to irritants such as allyl isothiocyanate (AITC). Both TRPV1 and TRPA1 have been reported to play important roles in orofacial pain. Improved knowledge of the contribution of TRPV1 and TRPA1 to oral cancer pain holds considerable promise for the development of novel, non-opioid treatment strategies that specifically address the unique pain experience of individual patients.

There is a lack of published data characterizing the sensory phenotype of tumor-related cancer pain, which has significant implications for understanding the underlying pathophysiological mechanisms of cancer pain. Quantitative sensory testing can provide insight into the mechanism(s) responsible for pain. In this proposal, we will test our hypothesis that the quality of pain experienced by oral cancer patients is dependent on the level of activation of specific channels on nociceptors. We will perform mechanical (von Frey testing) and chemical sensitivity tests (sensitivity to capsaicin, TRPV1 agonist, and AITC (TRPA1 agonist) on oral cancer patients, and compare the sensitivities to healthy subjects. For cancer patients, we will administer the validated University of California San Francisco (UCSF) Oral Cancer Pain Questionnaire to evaluate the correlation between mechanical and chemical thresholds with relevant aspects of pain.

We propose that the quality of pain experienced by oral cancer patients is quantifiable and dependent on the level of sensitization and activation of specific channels on nociceptors.

Study Type

Interventional

Enrollment (Anticipated)

80

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

  • Name: Brian Schmidt, MD, DDS, PhD
  • Phone Number: 212-995-4843
  • Email: bls322@nyu.edu

Study Contact Backup

  • Name: Caroline Sawicki, DDS, PhD
  • Phone Number: 212-995-4843
  • Email: cs6135@nyu.edu

Study Locations

  • United States
    • New York
      • New York, New York, United States, 10010
        • Recruiting
        • New York University College of Dentistry
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria (oral cancer patients):

  • Biopsy-proven squamous cell carcinoma (SCC) of the oral cavity that requires surgical resection
  • Lesion is at least 1 cm in greatest surface dimension

Exclusion Criteria (oral cancer patients):

  • History of prior surgical, chemotherapeutic, or radiation treatment for head and neck cancer
  • Pregnancy or lactation

Inclusion Criteria (healthy subjects):

  • In good general health as evidenced by medical history

Exclusion Criteria (healthy subjects):

  • Clinically and/or histologically proven oral pre-cancer, oral cancer
  • Pregnancy or lactation

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

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

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Mechanical Sensitivity
Time Frame: Baseline visit
Pain will be evaluated using verbal feedback from participants for mechanical sensitivity testing.
Baseline visit
Chemical Sensitivity
Time Frame: Baseline visit
Pain will be evaluated using a visual analogue scale for chemical sensitivity testing.
Baseline visit

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

NYU College of Dentistry

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

September 30, 2021

Primary Completion (Anticipated)

December 1, 2025

Study Completion (Anticipated)

December 1, 2025

Study Registration Dates

First Submitted

August 23, 2021

First Submitted That Met QC Criteria

August 23, 2021

First Posted (Actual)

August 27, 2021

Study Record Updates

Last Update Posted (Actual)

September 28, 2022

Last Update Submitted That Met QC Criteria

September 26, 2022

Last Verified

September 1, 2022

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • i21-00964

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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