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Slow-flow vascular malformations with identified causative variants in the phosphoinositide 3-kinase (PI3K) signalling pathway will receive alpelisib (provided by Novartis Pharmaceuticals), an oral alpha-specific PI3-kinase inhibitor for a total duration of 48 weeks as monotherapy, followed by 24 weeks of follow-up.

Fast-flow vascular malformations with identified causative variants in the RAS-MEK-ERK signalling pathway will receive mirdametinib (provided by SpringWorks Therapeutics, Inc.), an investigational oral MEK inhibitor for a total duration of 48 weeks as monotherapy, followed by 24 weeks of follow-up.

Alpelisib

Mirdametinib

Michelle de Silva, PhD

Tony Penington, MBBS, FRACS

Stephen Luen, MBChB, FRACP

Anthony Penington, MBBS, FRACS, MD(res), Grad Dip

Michelle de Silva, BSc(Hons), PhD, MGenCouns

Tony Penington, MBBS, FRACS.

Stephen Luen, MBChB, FRACP.

Lydia Pathmanathan, MBBS, FRACP.

Recent studies have demonstrated that growth of vascular malformations can be driven by genetic variants in one of 2 signalling pathways. Targeted drugs specific to these pathways have been developed and shown to be effective in treating cancer. This study will describe the effectiveness of (i) 48 weeks of alpelisib therapy for participants with slow-flow vascular malformations and a gene mutation in one of these signalling pathways (module 1) and (ii) 48 weeks of mirdametinib therapy for participants with fast-flow vascular malformations and a gene mutations in the other signalling pathway (module 2).

TARGET-VM is a modular open-label, signal seeking, phase II trial of targeted therapies for patients with vascular malformations. Patients with vascular malformations which are refractory to standard therapies, or in whom standard therapy is not appropriate, are potentially eligible for the clinical trial. Vascular malformations will be classified as slow-flow or fast-flow lesions using established clinical criteria. Genetic testing to identify causative variants in genes affecting the phosphoinositide 3-kinase (PI3K) signalling pathway for slow-flow vascular malformations or the Mitogen-Activated Protein Kinase (MAPK) signalling pathway for fast-flow vascular malformations must be performed using research protocols or commercial testing assays that are external to this clinical trial.

The study consists of individual modules, each evaluating the clinical efficacy of 48 weeks of targeted therapy. The treatment modules are:

1. Module 1 - Treatment for slow-flow vascular malformations Eligible patients with slow-flow vascular malformations with an identified causative variant in the PI3K signalling pathway will receive alpelisib, an oral alpha-specific PI3-kinase inhibitor for a total duration of 48 weeks as monotherapy (treatment period), followed by 24 weeks of follow-up (follow-up period).
2. Module 2 - Treatment for fast-flow vascular malformations Eligible patients with fast-flow vascular malformations with an identified causative variant in the MAPK signalling pathway will receive mirdametinib, an investigational oral MEK inhibitor for a total duration of 48 weeks as monotherapy (treatment period), followed by 24 weeks of follow-up (follow-up period).

TARGET-VM will be conducted only in Victoria, Australia.

i) Participants with slow-flow vascular malformations with an eligible gene mutation will receive 48 weeks of treatment with open-label alpelisib.

ii) Participants with fast-flow vascular malformations with an eligible gene mutation will receive 48 weeks of treatment with open-label mirdametinib

A Trial of Targeted Therapies for Patients With Slow-Flow or Fast-Flow Vascular Malformations

A Modular Open Label, Signal Seeking, Phase II Trial of Targeted Therapies for Patients With Slow-Flow or Fast-Flow Vascular Malformations (TARGET-VM)

From 6 months post analysis and article publication, the following will be made available long-term for use by future researchers from a recognised research institution whose proposed use of the data has been ethically reviewed and approved by an independent committee and who accept The Murdoch Children's Research Institute's (MCRI) conditions for access:

* Individual participant data that underlie the results reported in this article after de-identification
* Trial protocol, Statistical Analysis Plan, PICF The Sponsor-Investigator will be the long-term custodian after the archive period has finished.

Vascular malformations present with a range of different symptoms. Therefore, there is no single outcome measure that can capture the effectiveness of a systemic treatment across different patients. Thus for this study, an individualised primary outcome for each patient informed by their symptoms will be used, termed the Vascular Malformation Patient Specific Outcome Measure (VM-PSOM). The study "Outcome Committee" will define an individualised primary outcome for each patient informed by their symptoms and vascular malformation features prior to starting trial treatments. The VM-PSOM endpoint will therefore define a binary outcome for each patients (achieved or failed to reach the threshold improvement in the chosen measure).

VM-PSOM response at the 168 day follow-up visit assessment compared with the 48 week (end-of-treatment) VM-PSOM.

Objective response rate by volumetric MRI assessment comparing 48 week (end-of-treatment) MRI with baseline MRI. MRI scan will only be performed in patients where their vascular malformation is feasibly evaluable by MRI scan. Objective response is defined as ≥ 20% reduction from index date in the sum of measurable target lesion volume by volumetric analysis on MRI.

The mean scores in the OVAMA (Outcome measures for VAscular MAlformations) questionnaire will be calculated and analysed at specified time points. This is a set of questions developed specifically to measure symptom burden from vascular malformations. These questions are open-ended to allow the subject to describe how they feel. The questions are more tightly structured to allow comparison of answers to other people with vascular malformations. The questions have been designed in a way to determine if symptoms are getting better over time.

The mean scores in the OVAMA (Outcome measures for VAscular MAlformations) questionnaire will be calculated and analysed at specified time points.

Study title	NCT ID	Conditions	Interventions	Eligibility	Organization	Link
A Trial of Targeted Therapies for Patients With Slow-Flow or Fast-Flow Vascular Malformations	NCT05983159	Slow-Flow Vascu... Fast-Flow Vascu... Vascular Malfor... Venous Malforma... Lymphatic Malfo... Lymphatic Malfo... Lymphangioma Arteriovenous M... Venous Malforma... Cystic Hygroma Vascular Anomal... Vascular Anomal... PI3K Gene Mutat... MAP2K1 Gene Mut... PIK3CA-related ... Arteriovenous M... KRAS G12C KRAS G12D	Alpelisib Mirdametinib	2 Years -	Murdoch Childrens Research Institute
A Trial of Targeted Therapies for Patients With Slow-Flow or Fast-Flow Vascular Malformations	NCT05983159	Slow-Flow Vascu... Fast-Flow Vascu... Vascular Malfor... Venous Malforma... Lymphatic Malfo... Lymphatic Malfo... Lymphangioma Arteriovenous M... Venous Malforma... Cystic Hygroma Vascular Anomal... Vascular Anomal... PI3K Gene Mutat... MAP2K1 Gene Mut... PIK3CA-related ... Arteriovenous M... KRAS G12C KRAS G12D	Alpelisib Mirdametinib	2 Years -	Murdoch Childrens Research Institute

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