What are the best treatments for Proteus syndrome?

There is currently no cure for Proteus syndrome, so treatment is primarily multidisciplinary and focused on managing the specific overgrowths and complications unique to each patient. Management of Proteus syndrome often involves a combination of surgical interventions, physical therapy, and targeted medications, such as AKT inhibitors, to address the underlying genetic mosaicism.

What are the primary treatment approaches for Proteus syndrome?

Because Proteus syndrome is a complex, mosaic disorder characterized by the overgrowth of skin, bones, and adipose tissue, treatment must be highly personalized. Currently, there is no single "first-line" medication for everyone; instead, care is reactive and symptomatic. For individuals with Proteus syndrome, orthopedic surgery is often required to address limb length discrepancies or severe scoliosis. Because the tissue overgrowth in Proteus syndrome is progressive and can involve vascular malformations, surgical planning requires a team that understands the high risk of post-operative complications, including deep vein thrombosis (DVT) and pulmonary embolism.

Which medications are used for Proteus syndrome?

The medical community has moved toward targeted therapy for Proteus syndrome based on the discovery that it is caused by a somatic activating mutation in the AKT1 gene. Clinical research has focused on the use of AKT inhibitors, such as miransertib (ARQ 092), to potentially slow or stabilize the overgrowth process. While this represents a significant advancement, these medications are typically accessed through clinical trials or specialized compassionate use programs, as they are not yet standard-of-care for all patients with Proteus syndrome.

What non-pharmacological therapies are recommended?

Managing the physical manifestations of Proteus syndrome requires a robust support system to maintain quality of life and functional independence. These therapies are essential components of a long-term management plan:

• Physical Therapy: Essential for maintaining range of motion in joints affected by bony overgrowth.


• Occupational Therapy: Helps patients develop strategies for daily living tasks despite physical limitations or limb differences.


• Orthotics and Prosthetics: Custom-fitted braces or shoe lifts are frequently used to manage gait abnormalities and spinal curvature.


• Psychological Support: Chronic illness management is vital, as patients may face significant psychosocial challenges due to the visible nature of the condition.

Which specialists should be on the care team?

Given the multisystem nature of Proteus syndrome, a multidisciplinary care team is critical. Patients should ideally be followed at a specialized center with experience in rare overgrowth syndromes. Key specialists include:

• Clinical Geneticists: For ongoing monitoring of the genetic mutation and coordination of care.


• Orthopedic Surgeons: Specifically those with expertise in complex limb reconstruction and spinal surgery.


• Dermatologists: To manage skin lesions and connective tissue nevi.


• Vascular Specialists: To monitor and treat the vascular malformations that are common in Proteus syndrome.


• Hematologists: To manage the high risk of clotting and blood-related complications.

Next steps

• Consult with a geneticist to confirm the diagnosis through targeted biopsy and molecular testing.


• Connect with the Proteus syndrome community at DiseaseMaps.org to share experiences with the 5 other members registered on our platform.


• Register with the NIH GARD database to stay informed about the latest clinical trials and research updates.


• Request a referral to a major academic medical center that hosts a dedicated vascular anomalies or rare overgrowth clinic.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice; all treatment decisions must be made in consultation with a qualified medical professional.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Proteus Syndrome.


• Orphanet: Proteus syndrome (ORPHA:744).


• OMIM (Online Mendelian Inheritance in Man): Proteus Syndrome; PS (#176920).


• The Proteus Syndrome Foundation: Patient Resources and Research Updates.