Klinefelter syndrome
MONDO:0006823A sex chromosome disorder caused by the presence of an extra X chromosome in the male karyotype. Affected individuals are infertile and have a small penis and testes. They tend to have tall stature and long legs and may have difficulties with speech and language development. Gynecomastia may be present.
Also known as: 47,XXY syndrome, Klinefelter syndrome, Klinefelter's syndrome, Klinefelter's syndrome, XXY, XXY syndrome, XXY syndrome (Klinefelter syndrome), hypogonadotropic hypogonadism
14 clinical trials for this condition and its sub-types.
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Can hormone balancing boost fertility and health in klinefelter syndrome?
Disease control Recruiting nowThis study tests whether adjusting sex hormone levels with aromatase inhibitors can improve metabolic health and sperm production in men with Klinefelter syndrome. It also examines if adding semaglutide (a weight-loss drug) or hCG provides extra benefits. The trial involves 150 m…
Phase: PHASE3 • Sponsor: Georgios Papadakis • Aim: Disease control
Last updated Jun 27, 2026 12:31 UTC
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Frozen hope: new study aims to help boys become fathers after cancer
Disease control Recruiting nowThis study offers boys aged 0-17 the chance to freeze testicular tissue before undergoing treatments like chemotherapy or radiation that could cause permanent infertility. The tissue is stored for potential future use to achieve pregnancy. Researchers will track whether transplan…
Phase: NA • Sponsor: Mayo Clinic • Aim: Disease control
Last updated Jun 27, 2026 08:02 UTC
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New prenatal blood test aims to detect genetic disorders without invasive procedures
Diagnosis Recruiting nowThis study is testing a new blood test that looks for fetal cells in the mother's blood to detect genetic conditions like Down syndrome. The test will be compared to standard diagnostic methods such as amniocentesis or newborn testing. The study involves 1,000 pregnant individual…
Sponsor: BillionToOne Inc. • Aim: Diagnosis
Last updated Jun 27, 2026 13:06 UTC
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New DNA scan may unlock mysteries of sex development disorders
Diagnosis Recruiting nowThis study aims to find hidden genetic changes in people with disorders of sex development (DSD) whose standard genetic tests came back normal. Researchers will use a new technique called Optical Genome Mapping on a blood sample from 20 participants. The goal is to see if this me…
Phase: NA • Sponsor: University Hospital, Montpellier • Aim: Diagnosis
Last updated Jun 27, 2026 07:53 UTC
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Social coaching may ease anxiety and autism traits in rare chromosome conditions
Symptom relief Recruiting nowThis trial tests whether a 10-session group program called Social Management Training can improve mental health, executive function, and social skills in adults aged 16 to 69 who have sex chromosome aneuploidies (extra or missing sex chromosomes). Participants complete questionna…
Phase: PHASE1 • Sponsor: University of Oslo • Aim: Symptom relief
Last updated Jul 24, 2026 00:00 UTC
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Can freezing ovarian tissue help people with turner syndrome or early menopause have kids?
Knowledge-focused Recruiting nowThis study looks at whether freezing ovarian tissue can help preserve fertility in people aged 2-21 with conditions like Turner syndrome, galactosemia, or premature ovarian insufficiency. Participants may have surgery to remove and freeze a gonad, with a small piece used for rese…
Sponsor: Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) • Aim: Knowledge-focused
Last updated Aug 16, 2026 00:00 UTC
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Massive study aims to unlock mysteries of teen gynecologic disorders
Knowledge-focused Recruiting nowThis study is collecting medical data, blood, saliva, and tissue samples from up to 11,000 children, teens, and adults with known or suspected gynecologic conditions. The goal is to create a large database to better understand these conditions, including disorders of sex developm…
Sponsor: Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) • Aim: Knowledge-focused
Last updated Aug 08, 2026 00:03 UTC