A Two-stage Double-blind, Randomized, Placebo-controlled Study to Assess the Efficacy, Safety and Pharmacokinetics of Alpelisib in Pediatric and Adult Patients With Lymphatic Malformations Associated With a PIK3CA Mutation.
The main purpose of this study in participants with PIK3CA-mutated LyM is to assess the change in radiological response and symptom severity upon treatment with alpelisib film-coated tablets (FCT) as compared to placebo.
• Signed informed consent and assent (when applicable) from the participant, parent, legal authorized representative or guardian.
• Participant must be willing to remain at the clinical site as required by the protocol and be willing to adhere to study restrictions and examination schedules.
• Participant has a physician confirmed and documented diagnosis of a symptomatic LyM at the time of informed consent (Note: the physician must confirm that the LyM cannot be included under the PROS diagnostic criteria).
• Participant is not considered as a candidate for or is not willing to receive non-drug therapies including but not limited to sclerotherapy, embolization, and surgery until the completion of Week 24 in Stage 1 and 2.
• Participant has evidence of a somatic mutation(s) in the PIK3CA gene prior to randomization.
• Participant has at least one measurable LyM lesion confirmed by BIRC assessment prior to randomization.
• Participants must be able to ingest study drug (either in tablet form or as a drinkable suspension \[Groups 1 to 4\] or granules or as an oral suspension \[Group 5\]) as assessed within 7 days before study treatment start. Drug administration via feeding tubes is allowed.