Chronic Graft-versus-Host Disease in the Oral Cavity of Patients Following Allogeneic Hematopoietic Stem Cell Transplant and Including Healthy Controls

Description

Background:

* Chronic graft-versus-host disease (cGVHD) is a multi-organ severe alloimmune and – autoimmune disorder that occurs after allogeneic hematopoietic stem cell transplantation (HSCT). It is characterized by immune dysregulation, immunodeficiency, impaired organ function, and decreased survival.
* Manifestations of cGVHD in the oral cavity are observed in 45-85% of cGVHD patients and include 3 components: limitation of mouth opening, oral mucosal changes (lichenoid lesions, ulceration) and salivary gland changes.
* There is an urgent need for new tools to diagnose and treat oral cGVHD. To develop targeted therapies and non-invasive methods for serial screening, an improved understanding of the clinical course and underlying mechanisms of oral cGVHD are required.

Objectives:

* Advance understanding of cGVHD pathophysiology and generate hypotheses for future cGVHD studies by tracking the longitudinal development of cGVHD in the oral cavity and transplant-related changes in the oral microenvironment.
* Leverage knowledge about the impact of transplant on the oral cavity to develop better protocols for supportive dental care, to refine clinical definitions and classifications of oral cGVHD, and to test and improve criteria and tools for clinical trials.
* Include healthy volunteer cohorts both as a direct control group for HSCT patients, and to characterize measures of interest that were not previously defined in the normal oral cavity.

Eligibility:

* Patients who are scheduled to undergo allogeneic HSCT at the National Institutes of Health (NIH) or who have already undergone allogeneic HSCT at the NIH or elsewhere.
* Healthy individuals who have not undergone transplant and are willing to undergo oral exam and sample collection will be included in a control group.
* All study subjects, including patients and healthy individuals, must be able to provide written informed consent and be willing to return to the NIH Dental Clinic for scheduled evaluations.

Design:

* This is a single site, observational study with four cohorts. There are 2 transplant cohorts: the New Transplant Cohort (“Cohort NT”; approximate n=300) consists of patients who are scheduled to undergo allogeneic HSCT (under another protocol at the NIH) and the Prior Transplant Cohort (“Cohort PT”; approximate n=100) consists of patients who have already undergone allogeneic HSCT. These Cohorts will have up to 7 regularly scheduled visits across 3 years, along with a variable number of acute-episode visits. Subjects enrolled as NT or PT, who require a subsequent transplant are eligible to be either enrolled or re-enrolled into the PT cohort to be followed for the 7 visits in 3 years. Additionally, subjects will have the opportunity to participate in optional annual follow-up visits in years 4-10 post transplant.
* The other 2 Cohorts include healthy volunteers: the Healthy-controls Longitudinal (HL) Cohort (“Cohort HL”; approximate n=20) includes subjects who will participate in up to 4 study visits across 1 year, and the Healthy-controls Short-term (HS) Cohort (“Cohort HS”; approximate n=80) will participate in a single baseline visit.
* Each visit will include collection of biologic samples, patient-reported data and clinical assessments.
* Initial statistical analysis will begin with unsupervised clustering methods and simple logistic regression to identify biomarkers important in oral cGVHD. Based upon the results of these initial analyses, more complex multivariate statistical models will be developed to both classify and predict onset of oral cGVHD. Given the hypothesisgenerating nature of this study, additional prospective statistical analysis plans will be developed in consultation with a statistician as the study progresses to address specific scientific questions.