Kisho is an information platform, not a medical provider. Nothing on this site constitutes medical advice, diagnosis, or treatment recommendations. All content is aggregated from publicly available sources (including ClinicalTrials.gov, PubMed, FDA.gov, and Orphanet) and is provided for informational purposes only. Clinical trial eligibility, treatment decisions, and any health-related actions should always be discussed with a qualified healthcare professional. Kisho does not endorse any specific therapy, organization, or clinical trial. Terms of use · Privacy policy
The 49,XXXXY syndrome represents a chromosomal anomaly of the aneuploidic type characterized by the presence of three extra X chromosomes in males.
Biomarker and diagnostic research for 49,XXXXY syndrome has been reported in the published literature.
Estimated prevalence: Unknown (Unknown prevalence).
2 clinical trials registered, 2 recruiting. Interventions under study include other interventions. Research is primarily sponsored by academic and government institutions.
99 publications have been identified in PubMed for 49,XXXXY syndrome. Research spans Case Report / Case Series (27%), Basic Science / Preclinical (26%), and Epidemiology / Natural History (20%).
Research Type | Count | % of Total |
|---|---|---|
Patient case studies | 27 | 27% |
Data assembled from 4 of 12 sources · Last updated Sep 18, 2026, 11:36 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about 49,XXXXY syndrome
Laboratory research |
26 |
26% |
Disease patterns and progression | 20 | 20% |
Research summaries | 14 | 14% |
Clinical study results | 5 | 5% |
Other research | 3 | 3% |
Testing and diagnosis research | 2 | 2% |
New treatment approaches | 2 | 2% |
Raffo M (2026). [PMID: 40721164](https://pubmed.ncbi.nlm.nih.gov/40721164/). *Fertility and sterility*. [Clinical Trial Publication]
Swenson KS (2026). [PMID: 41190564](https://pubmed.ncbi.nlm.nih.gov/41190564/). *American journal of medical genetics. Part A*. [Clinical Trial Publication]
Singh G (2026). [PMID: 41527322](https://pubmed.ncbi.nlm.nih.gov/41527322/). *The American journal of case reports*. [Clinical Trial Publication]
Alfano M (2026). [PMID: 40658795](https://pubmed.ncbi.nlm.nih.gov/40658795/). *The Journal of clinical endocrinology and metabolism*. [Basic Science / Preclinical]
Ferraioli G (2026). [PMID: 40191911](https://pubmed.ncbi.nlm.nih.gov/40191911/). *Andrology*. [Epidemiology / Natural History]
Hart SA (2026). [PMID: 41457053](https://pubmed.ncbi.nlm.nih.gov/41457053/). *Molecular genetics & genomic medicine*. [Case Report / Case Series]
Sullivan AW (2026). [PMID: 40944728](https://pubmed.ncbi.nlm.nih.gov/40944728/). *Applied neuropsychology. Adult*. [Case Report / Case Series]
Hardy M (2026). [PMID: 41319308](https://pubmed.ncbi.nlm.nih.gov/41319308/). *Zoo biology*. [Basic Science / Preclinical]
Su X (2026). [PMID: 40699415](https://pubmed.ncbi.nlm.nih.gov/40699415/). *International urology and nephrology*. [Basic Science / Preclinical]
Ahmed N (2026). [PMID: 41544487](https://pubmed.ncbi.nlm.nih.gov/41544487/). *Sleep medicine*. [Case Report / Case Series]
AI-curated news mentioning 49,XXXXY syndrome
Updated Jul 21, 2026
FDA approved Casgevy CRISPR gene therapy for children as young as 2 with sickle cell disease on July 1, 2026. Here's what families need to know about this milestone. Approximately 5,500 additional American children are now eligible for this established one-time therapy, according to Vertex Pharmaceuticals, Casgevy's developer. Casgevy also covers transfusion-dependent beta-thalassemia in this new age indication. Sickle cell disease is a lifelong inherited blood disorder that warps red blood cells into stiff, crescent shapes that can block blood flow, starving organs and tissues of oxygen. The world's first CRISPR-based gene therapy has been approved for children as young as two years old, opening the possibility of a single, potentially curative treatment to thousands of American children with sickle cell disease before years of organ damage can narrow what medicine can do for them. Families with children aged 2 and older who have sickle cell disease should speak with their pediatric hematologist about whether Casgevy is appropriate to consider at this stage of their child's disease. Ask specifically which authorized treatment centers perform Casgevy in your region. Treatment is available only at specialized sites, and geographic access remains limited. Contact your child's insurance plan or Medicaid office to ask about coverage. Medicaid coverage for gene therapies varies by state, and some states have developed outcomes-based payment models for high-cost therapies. "With today's decision, pediatric patients as young as 2 years of age can now access a critical additional treatment option to treat these debilitating, life-threatening diseases," said Karim Mikhail, acting director of the Office of Therapeutic Products at the FDA's Center for Biologics Evaluation and Research, according to the FDA press announcement. Casgevy is a non-viral, ex vivo CRISPR/Cas9 gene-edited cell therapy.
A new treatment for children aged 2 or older with sickle cell disease has been approved by the U.S. Food & Drug Administration. In a press release on Wednesday, the FDA announced it had approved Casgevy, the first gene therapy for children with sickle cell disease. (NewsNation) — A new treatment for children aged 2 or older with sickle cell disease has been approved by the Food & Drug Administration (FDA). In a Wednesday news release, the FDA announced it had approved Casgevy, the first gene therapy for children with the disease. “Casgevy is a gene therapy consisting of the patient’s own (autologous) hematopoietic (blood) stem cells, administered as a one-time single dose for intravenous infusion,” the release noted. “Pediatric patients as young as 2 years of age can now access a critical additional treatment option to treat these debilitating, life-threatening diseases,” Karim Mikhail, the acting director of the Center for Biologics Evaluation and Research, wrote. “These disorders carry a heavy burden for children and their families, affecting growth, development, and long-term health in profound ways,” Megha Kaushal, acting deputy director of the Office of Therapeutic Products in CBER, said in the release.