Effects of Stem Cell Transplantation on Bacteria in the Mouth

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00476450
Recruitment Status : Completed
First Posted : May 22, 2007
Last Update Posted : October 6, 2017
Information provided by (Responsible Party):
National Institutes of Health Clinical Center (CC)

Brief Summary:

This study will examine bacteria in patients mouths at different times during stem cell transplantation and recovery. Drugs patients receive as part of the conditioning process for a stem cell transplant increase their risk of infection. There might be a link between the bacteria in the mouth and the bacteria that can cause infections. Knowing the changes in bacteria might help researchers determine the best method to prevent infections.

Patients 18 years of age and older who are scheduled to receive a stem cell transplant may be eligible for this study.

Participants undergo the following procedures:

Review of medical records

Interview about their oral care

Oral examination

Collection of oral specimens just before the stem cell transplant, immediately after the transplant, and 3 weeks after the transplant. The specimens are obtained as follows:

  • <TAB>-About one-fourth teaspoon of saliva is collected with a suction device similar to that used in a dental office.
  • <TAB>-Plaque from the surface of a tooth is collected with a plastic toothpick.
  • <TAB>-Skin cells from the inside of the cheek and the surface of the tongue are collected with a small soft brush.
  • <TAB>-If a tube is inserted into the patient s lungs to assist breathing and the patient is admitted to the intensive care unit, a specimen from the lungs is collected.

Patients are followed for 100 days after their transplant. Additional oral specimens are obtained from those who develop signs and symptoms of respiratory infection.

Condition or disease
Allogeneic Peripheral Blood Stem Cell Transplant

Detailed Description:

The mouth is a complex biological ecosystem normally containing over 700 different species of bacteria. These bacteria live in an exopolysacchride matrix biofilm. Usually, bacteria colonize the oral cavity benignly. However, there are several studies in critically ill patients demonstrating changes in oral flora with 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. A common complication of allogeneic peripheral blood stem cell transplant (PBSCT) is infection and pneumonia. Identification of potential pathogens in the oral cavity of allogeneic stem cell patients could indicate a similar association between oral pathogens and infection. A few studies describe the oral microbial community in these patients and the possibility that these organisms are a source of infection.

The primary objective of this study is to describe the changes in oral microbial flora of allogeneic SCT patients at three time points during their treatment and recovery. Observed differences in microbial organisms from baseline (prior to transplantation), through neutropenia (within 48 hours of nadir post-transplantation) and myeloid engraftment (14-21 days post transplantation) will be described.

In the course of their treatment, if patients develop respiratory signs and symptoms that require either a re-admission to an inpatient unit or intensive care unit admission, then additional oral specimens will be collected.

The secondary objective is to assess the oral microbial flora found after development of respiratory signs and symptoms in allogeneic PBSCT patients in the first 100 days post-transplant. In addition, if the patient requires intubation, tracheal aspirates and oral specimens will be collected.

The population is composed of adult patients who are planning to undergo an allogeneic PBSCT and can provide informed consent. The design is a prospective, descriptive study of the microbial flora of the oral cavity of adult allogeneic stem cell transplant patients. Saliva specimens, dental plaque and mucosal brushings will be collected at the three different times. Oral specimens will be obtained from patients who develop respiratory signs or symptoms that require an additional inpatient or intensive care unit admission. Patients will be followed and assessed for respiratory signs, symptoms, inpatient or ICU admission until day 100 post-transplant. The presence of bacteria (type and species) will be determined by molecular genetics. The identification of bacteria will be studied using various comparative molecular techniques, including DNA arrays and Real-Time Polymerase Chain Reaction (RT-PCR).

Study Type : Observational
Actual Enrollment : 50 participants
Observational Model: Other
Time Perspective: Prospective
Official Title: Effects of Peripheral Blood Stem Cell Transplantation on the Microbial Flora of the Oral Cavity
Study Start Date : May 16, 2007
Study Completion Date : March 7, 2016

Primary Outcome Measures :
  1. Description of the oral microbiome [ Time Frame: Baseline, nadir of ANC and engraftment. ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

All adult patients admitted to the Clinical Research Center of the NIH who are 18 years of age or older who are scheduled to undergo an allogeneic PBSCT are eligible for enrollment. Collection of oral specimens in children who are allogeneic transplant recipients would increase the anxiety in these participants and may require sedation. For this reason children will be excluded from this protocol.

All adult patients who provide informed consent and who are scheduled to receive an allogeneic bone marrow transplant are eligible for enrollment.


Patients who have had recent oral surgery or oral trauma will be excluded.

Patients with tracheostomies will also be excluded.

Patients with sickle cell disease or chronic granulomatous disease who are being transplanted will be excluded from the protocol.

Patients who are less than 18 years of age will be excluded.

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 identifier (NCT number): NCT00476450

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)
Principal Investigator: Nancy Ames, R.N. National Institutes of Health Clinical Center (CC)

Responsible Party: National Institutes of Health Clinical Center (CC) Identifier: NCT00476450     History of Changes
Other Study ID Numbers: 070153
First Posted: May 22, 2007    Key Record Dates
Last Update Posted: October 6, 2017
Last Verified: March 7, 2016

Keywords provided by National Institutes of Health Clinical Center (CC):
Oral Microbial Flora
Hematopoietic Stem Cell Transplant
Allogeneic Stem Cell Transplant