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A Description of Bacteria in the Mouths of Patients With Severe Aplastic Anemia

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ClinicalTrials.gov Identifier: NCT01900119
Recruitment Status : Completed
First Posted : July 16, 2013
Last Update Posted : January 10, 2018
Information provided by (Responsible Party):

Study Description
Brief Summary:


- This research is being done to describe the types of bacteria found in the mouths of patients who have severe aplastic anemia (SAA) and are treated with drugs that suppress the immune system or with stem cell transplant. People with SAA who receive these treatments are more likely to get infections. Studies show that there might be a link between the bacteria in your mouth and those bacteria that can cause infections. The bacteria found in the mouths of patients with SAA will be described.


- To understand the changes in mouth bacteria that are related to treatment and to describe the oral bacterial environment.


  • Adults at least 18 years of age who are going to be treated for SAA.
  • Healthy volunteers at least 18 years of age.


  • Participants will answer questions about their medical history and dental care. Their mouths will be examined.
  • Participants with SAA will be tested during treatment for their disease, over the course of 1 year. All participants with SAA will be tested at 3 scheduled appointments. Any participants who require a breathing tube will receive additional tests.
  • Healthy volunteers will be tested during 1 visit.
  • Participants will give two samples each time. A saliva sample will be taken with a disposable padded tool. Skin cells will be collected from the tongue with a small plastic brush.

Condition or disease
Severe Aplastic Anemia (SAA)

Detailed Description:
The mouth is a complex biological ecosystem normally containing over 700 different species of bacteria. Some of these bacteria live in an exopolysacchride matrix biofilm and occupy specific niches in this complex oral environment. Understanding the oral environment and the microbiota that inhabit it will assist in determining their impact on health and disease. There are several studies in critically ill patients demonstrating changes in oral bacteria related to acute illness. Identification of respiratory pathogens in the mouth has led researchers to hypothesize that a relationship exists between the oral cavity and pulmonary infections. Identification of potential pathogens in the oral cavity of patients with severe aplastic anemia could indicate a similar association between oral pathogens and infection in patient who develop respiratory infections that are severe enough to require intubation. This descriptive case-control study will characterize the oral microbiota of patients who have severe aplastic anemia (SAA). Patients will be followed for 1 year after treatment for development of respiratory symptoms that require intubation (cases). The cases will be compared to two groups of controls, namely those SAA patients who did not require intubation that received treatment for SAA and normal healthy volunteers who are age and gender matched. A difference in the oral microbiome will be identified in specimens collected before and after treatment and in those patients who require intubation.

Study Design

Study Type : Observational
Actual Enrollment : 24 participants
Time Perspective: Prospective
Official Title: A Description of the Oral Microbiome of Patients With Severe Aplastic Anemia
Study Start Date : July 11, 2013
Primary Completion Date : July 5, 2016
Study Completion Date : July 5, 2016

Resource links provided by the National Library of Medicine

U.S. FDA Resources

Groups and Cohorts

Outcome Measures

Primary Outcome Measures :
  1. Compare the oral microbiome of SAA patients prior to treatment and after treatment. [ Time Frame: one year following enrollment ]

Eligibility Criteria

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 99 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
  • All adult patients who are scheduled to receive treatment for SAA will be screened for this protocol. These patients will be recruited from the numerous protocols that are actively accepting new research participants at the Clinical Center, NIH.


Any adult patient (greater than or equal to18 years of age), diagnosed with SAA.


Any SAA patient found to have significant tooth loss from decay or is edentulous are excluded. This exclusion criteria will be assessed by the PI or her representative prior to signing the informed consent.

Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01900119

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institutes of Health Clinical Center (CC)
National Heart, Lung, and Blood Institute (NHLBI)
Principal Investigator: Nancy Ames, R.N. National Institutes of Health Clinical Center (CC)
More Information

Additional Information:
Responsible Party: National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier: NCT01900119     History of Changes
Other Study ID Numbers: 130161
First Posted: July 16, 2013    Key Record Dates
Last Update Posted: January 10, 2018
Last Verified: January 4, 2018

Keywords provided by National Institutes of Health Clinical Center (CC):
Oral Microbiome
Next Generation Sequencing

Additional relevant MeSH terms:
Anemia, Aplastic
Hematologic Diseases
Bone Marrow Diseases