Ganaxolone for treating seizures caused by CDKL5 deficiency disorder in people 2 years and over as of February 2025

This page presents a standardized, committee-reviewed assessment of the reimbursement risk associated with Ganaxolone for treating seizures caused by CDKL5 deficiency disorder in people 2 years and over as of February 2025, calibrated against historical HTA and payer outcomes across the US, EU4, UK, and Japan using a structured 10-domain evaluation framework.

Updates & Coverage Scope

MARA Ratings reflect the evidence and payer context available as of the stated date. Where material new evidence or payer decisions emerge, MARA may issue a rating action under the Rating Actions & Surveillance Policy.

For market-specific extensions or updated cut dates, request a revised assessment.

What the Complimentary MARA Rating Includes

The Full MARA Assessment provides full 10-domain scoring, weighted determinants, benchmarking against comparable assets, and historical context calibrated to observed HTA outcomes.

Reimbursement Risk Positioning

This assessment positions the asset relative to reimbursement thresholds observed across major HTA bodies. It distinguishes structural drivers of reimbursement risk from variables that are typically sensitive to evidence maturity or price expectations.

The Full MARA Assessment provides weighted scoring across all 10 domains and benchmarks this positioning against historical reimbursement outcomes for comparable evidence profiles.

Selected Risk Drivers

Below is a snapshot of domains that materially influence the MARA Rating. The Full MARA Assessment provides complete 10-domain scoring and the evidence-linked rationale for each domain outcome.

Clinical effectiveness

The clinical effectiveness of ganaxolone is uncertain, as the evidence from the Marigold trial indicates a mean decrease of 14% in seizure frequency compared to a 65% increase in the placebo group. While there is some evidence of a reduction in seizure frequency, the committee expressed concerns about the reliability of these results due to potential biases and the natural variability of seizure frequency. The lack of robust long-term data further undermines the strength of the evidence.

Cost effectiveness

The cost-effectiveness estimates for ganaxolone are deemed unreliable due to structural uncertainties in the economic model. The committee noted that the ICERs presented were not reflective of the uncertainties in the modelling, and there was insufficient evidence to establish that ganaxolone is cost-effective compared to usual care.

Quality of life

The evidence regarding HRQoL is derived from utility values based on proxy conditions, which introduces significant uncertainty. The Marigold trial did not collect direct HRQoL data, and the estimates used may not accurately reflect the impact of ganaxolone on quality of life for patients with CDD. The committee acknowledged the limitations of the utility data and the potential for overestimation of benefits.

The Full MARA Reimbursement Risk Assessment expands this analysis with weighted scoring, benchmarking depth, and ranking versus hundreds of comparable assets.

Benchmarking & Historical Calibration

This asset is benchmarked against therapeutic-area comparators and a historical dataset of previously assessed products. MARA calibrates rating bands against observed reimbursement outcomes across major HTA bodies.

Scope of the Full MARA Assessment

Designed to support governance and diligence before major commitments in pricing, evidence generation, partnering, or launch planning.

What is the reimbursement risk of Ganaxolone for treating seizures caused by CDKL5 deficiency disorder in people 2 years and over as of February 2025?

The MARA Rating provides a standardized, committee-reviewed assessment of the reimbursement risk associated with this drug–indication pair, calibrated against historical HTA and payer outcomes across the US, EU4, UK, and Japan.

The licensed report includes structured scoring across 10 payer-relevant domains, evidence-linked rationale, benchmarking against comparable assets, and identification of variables that may influence rating migration.

The complimentary summary provides the rating band, market access score, confidence level, and high-level context. Detailed domain scoring, benchmarking analysis, and full rationale are available in the licensed report.

Related Reimbursement Risk Assessments

Surveillance Status

This rating is subject to defined surveillance under the Rating Actions & Surveillance Policy. Where material new evidence, payer decisions, or policy changes occur, MARA may issue a rating action (affirmation, upgrade, downgrade, or under review) with an as-of date and rationale.

This aligns every report page with your governance system.

Professional Use Notice

MARA Rating is an independent analytical opinion intended for professional use in market access, HTA, and investment contexts. It does not constitute medical, legal, or investment advice.

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