Natural History Study of Patients With Excess Androgen

Conditions

• Congenital Adrenal Hyperplasia (CAH)
• Familial Male-Limited Precocious Puberty (FMPP)

Eligibility Criteria

Sex

ALL

Age

1 Day - 99 Years

Healthy Volunteers

Not accepted

Study Details

This study will evaluate and gather information in patients with genetic causes of too much androgen (male-like hormone) in order to better understand the effects of too much androgen and describe problems associated with it. Too much androgen in childhood, if untreated, results in rapid growth and early puberty with early cessation of growth and short stature in adulthood. Too much androgen in adulthood may result in infertility, and women may have excess facial hair, acne and a more male-like appearance. Excess androgen may also affect mood and behavior and possibly the secretion of other hormones, such as insulin. Two genetic diseases that result in early childhood androgen excess are congenital adrenal hyperplasia (CAH) and familial male-limited precocious puberty (FMPP). Patients with known or suspected CAH due to 21-hydroxylase deficiency, 11- hydroxylase deficiency, or 3-beta-hydroxysteroid dehydrogenase deficiency and males with known or suspected FMPP may be eligible for this study. Patients with both classic and non-classic CAH are eligible, and patients with androgen excess of unknown cause may be eligible. Participants undergo the following procedures: * Medical history and physical examination. * Fasting blood tests for analysis of hormones, blood chemistries including blood sugar and cardiovascular risk factors such as lipids. * Oral glucose tolerance test for patients with elevated insulin levels. For this test, a catheter (plastic tube) is placed in a vein in the patient's arm. The patient drinks a sugar-containing fluid and blood samples are collected through the catheter at intervals starting with drinking the solution, and then 30, 60 and 120 minutes after drinking the solution. * 24-hour urine collection to measure hormone levels in the urine. * DNA testing for patients with 21-hydroxylase deficiency to help identify the type of genetic mutation responsible for the disease. * X-ray of the left hand to measure bone age in growing children. The x-ray is used to determine how far into puberty the child is and how much growth potential is left in the bones. * A pelvic ultrasound in females and testicular ultrasound in males to evaluate the size and development of the gonads (ovaries in females and testes in males). * Cognitive and psychological tests, including an IQ test and evaluation of memory, achievement and behavior. * Other tests and evaluations based on medical need. The schedule for these procedures varies. In a part of the study involving only patients with CAH, growing children are evaluated twice (once in childhood and once after reaching adult height), and adults are evaluated once. In another part of the study involving patients with CAH and FMPP, growing children are seen twice a year, and adults and children who have reached adult height may be seen annually. Additional visits may be scheduled if medically indicated. In this part of the study, females are asked to keep a record of their periods after their first menstrual cycle.

Key Dates

Start date

Jan 2, 2006

Status verified

Jun 2026

Study Design

Enrollment

3,000 participants (estimated)

Arms

• Arm: 1/CAH Patients Managed at the NIH
  Patients with Congenital Adrenal Hyperplasia (CAH).
• Arm: 2/CAH Patients Managed by Outside Physicians
  Patients with Congenital Adrenal Hyperplasia (CAH) followed by home physician post visit at NIH.
• Arm: 3/Relatives of Patients
  Relatives (mostly parents) of patients will be genotyped. This is often necessary to establish the genotype of the patient.
• Arm: 4/FMPP Patients
  Patients with Familial Male-Limited Precocious Puberty (FMPP).
• Arm: 5/Patients with Androgen Excess of Unknown Etiology
  Patients with Androgen Excess of Unknown Etiology followed by home physician post visit at NIH.

Primary Outcome Measure

To elucidate a comprehensive phenotypic profile for patients with CAH and FMPP [ Time Frame: Ongoing ]

Central Contacts

• Deborah P Merke, M.D.
  (301) 496-0718
  [email protected]

Locations (2)

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