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Genes Associated With Hereditary and Drug-Induced Gingival Overgrowth

This study has been completed.
Information provided by:
National Institutes of Health Clinical Center (CC) Identifier:
First received: February 18, 2005
Last updated: June 30, 2017
Last verified: April 19, 2011

This study will examine common features of gingival overgrowth (excessive growth of the gums around the teeth) that develops in patients with the hereditary form of the condition and in those who develop the condition as a side effect of medications. A better understanding of gingival overgrowth may help scientists develop medications with fewer oral side effects.

Patients of any age with hereditary gingival fibromatosis and their blood relatives, and patients of any age with gingival overgrowth who are taking medications associated with development of the disorder, including phenytoin (diphenylhydantoin or Dilantin), cyclosporine, and calcium-channel blockers, may be eligible for this study.

Participants undergo a medical and dental history, including a history of medication use; detailed examination of the teeth, periodontium, head, and neck; photographs of teeth with gingival overgrowth; dental x-rays; and blood tests. DNA is extracted from a blood sample to look for genes related to gingival overgrowth.

Patients with gingival overgrowth are offered two options, as follows:

  • Tissue biopsy: A tissue sample is taken from each affected site, with a maximum of three biopsies. For the procedure, lidocaine is first injected into the gum to numb the tissue. Then, a cookie-cutter instrument is pushed into the numbed skin, and a small piece of tissue is removed.
  • Gingivectomy: Surgical removal of the overgrown gingival.

Gingival Overgrowth

Study Type: Observational
Official Title: Genes Associated With Hereditary and Drug-Induced Gingival Overgrowth

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Enrollment: 45
Study Start Date: February 15, 2005
Estimated Study Completion Date: April 19, 2011
Detailed Description:
The purpose of this protocol is twofold: 1) to continue identification of genes associated with hereditary gingival fibromatosis (HGF), a type of gingival overgrowth 2) to investigate the genes up-regulated by medications that induce gingival overgrowth. These studies will establish if common mechanisms are involved in the hereditary and drug-induced processes. If a common pathway is identified, it could lead to the development of assays that could be used to screen new medications for their potential deleterious effects on periodontal tissues. In addition, understanding the mechanisms involved in gingival overgrowth could lead to the development of tissue engineering approaches to repair gingival defects. Genes will be identified from DNA samples collected from patients with hereditary gingival fibromatosis. These will be compared with DNA and tissue samples taken from patients taking medications known to induce gingival overgrowth (phenytoin, cyclosporine and calcium channel blockers).

Ages Eligible for Study:   2 Years to 80 Years   (Child, Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Patients of any age, gender, and racial/ethnic group with hereditary gingival fibromatosis (HFG) as diagnosed with HGF by clinical appearance that consists of attached gingival covering the lower 1/3 or more of the clinical crowns of teeth in an individual not taking medications associated with gingival changes.

Blood relatives of affected individuals who are at risk of inheriting HGF.

Patients of any age, gender, and racial/ethnic group taking one of the three medications associated with drug-induced gingival overgrowth (phenytoin diphenylhydantoin or Dilantin, cyclosporine, or calcium-channel blockers).

Patients with six or more teeth.


Patients with significant cognitive impairment.

Pregnant patients or lactating patients.

Patients unwilling to give informed consent.

Patients with less than six teeth.

  Contacts and Locations
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, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00104026

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Dental and Craniofacial Research (NIDCR)
  More Information

Publications: Identifier: NCT00104026     History of Changes
Other Study ID Numbers: 050103
Study First Received: February 18, 2005
Last Updated: June 30, 2017

Keywords provided by National Institutes of Health Clinical Center (CC):
Periodontal Disease
Calcium-Channel Blockers
Hereditary Gingival Fibromatosis
Gingival Overgrowth
Gum Overgrowth

Additional relevant MeSH terms:
Gingival Overgrowth
Gingival Diseases
Periodontal Diseases
Mouth Diseases
Stomatognathic Diseases processed this record on September 20, 2017