Use of phosphoinositide 3-kinase inhibitors for treatment of vascular malformations

1. A method of treating a venous malformation in a subject in need thereof, comprising administering to the subject an effective amount of BYL719 (Alpelisib),

wherein the venous malformation is not associated with congenital lipomatous overgrowth with vascular, epidermal, and skeletal anomalies syndrome (CLOVES), Klippel-Trenaunay syndrome (KTS), or fibro-adipose vascular anomaly (FAVA), and

wherein the subject has a gain-of-function mutation in the PI3K/AKT pathway.

2. The method of claim 1 , wherein the gain-of-function mutation is an activating mutation of PIK3CA, or a mutation in at least one of AKT1, AKT2, AKT3, and IRS2.

3. The method of claim 2 , wherein the activating mutation is selected from the group consisting of R88Q, E542K, E545K, E545Q, H1047L, H1047Q, H1047R, C420R, and I143V.

4. The method of claim 1 , wherein the venous malformation is located in the brain, and/or within the skin.

5. The method of claim 1 , wherein:

a) the subject suffers from multiple venous malformations, a malignancy, a multisystem genetic disorder, or a combination thereof; or

b) the surgical treatment of the venous malformation would be high-risk.

6. The method of claim 1 , wherein BYL719 (Alpelisib) is administered systemically or locally.

7. The method of claim 1 , wherein BYL719 (Alpelisib) is administered topically, parenterally, or orally.

8. The method of claim 1 , further comprising administering to the subject a second agent that inhibits the PI3K/AKT pathway, wherein the second agent is in an amount that, together with the agent of claim 1 , effectively treats the venous malformation.

9. The method of claim 1 , wherein the venous malformation is a sporadic venous malformation.