Viltolarsen NCT04687020 Clinical Landscape 2026

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This Clinical Landscape Report was built with PatSnap Life Sciences MCP workflows. Clinical Trials MCP supplies protocol and result records, Drug & Asset MCP adds asset context, and Company & Deal Intelligence MCP resolves sponsor background. Use the same structured MCP building blocks in your research workflow.

Data snapshot: 28 September 2026. This strategic research report is not medical, regulatory or investment advice. Trial status and dates can change.

Phase 4

Clinical phase

Active, not recruiting

Recruitment status

9

Planned enrollment

2032-09-01

Primary-completion proxy

Executive view

NCT04687020 evaluates Viltolarsen in Muscular Dystrophy, Duchenne. The disclosed sponsor is NS Pharma, Inc., the design is Interventional, and the geographic footprint is Canada, United States. The first listed primary endpoint is Number of participants with treatment related Adverse Events as assessed by CTCAE v4.0, assessed over baseline to up to 120 months of treatment.

The key landscape question is whether this protocol can generate a clinically interpretable signal relative to nearby programs. Phase alone is not a measure of evidence quality. Endpoint relevance, comparator choice, masking, enrollment feasibility, patient selection, country coverage and follow-up must be considered together.

PatSnap MCP Servers make this assessment reproducible by keeping protocol facts, result evidence, asset attributes and sponsor identity in separate structured calls.

How the MCP evidence stack was assembled

Clinical Trials MCP clinical_trial_fetch retrieved the design, outcomes, phase, status, enrollment, sponsor, countries and timing for NCT04687020 and selected peers. clinical_trial_result_fetch supplied detailed result records from the wider Muscular Dystrophy, Duchenne landscape. Drug & Asset MCP drug_fetch was queried for Viltolarsen, while Company & Deal Intelligence MCP organization_fetch was queried for NS Pharma, Inc..

This separation reduces a common diligence error: treating a registry label, a company description or a result excerpt as if each represented the complete evidence package. Explore the source workflow at the PatSnap MCP marketplace.

Trial landscape table

Trial	Asset / intervention	Phase / status	Sponsor	Geography	Primary endpoint	Readout proxy
NCT04687020	Viltolarsen	Phase 4 / Active, not recruiting	NS Pharma, Inc.	Canada, United States	Number of participants with treatment related Adverse Events as assessed by CTCAE v4.0 baseline to up to 120 months of treatment	2032-09-01
NCT05670730	Delpacibart zotadirsen	Phase 1/2 / Completed	Avidity Biosciences, Inc.	United States	Incidence of treatment-emergent adverse events (TEAEs) Through study completion, up to Day 85 (Part A) or Day 169 (Part B)	2024-11-25
NCT05540860	Sevasemten	Phase 2 / Active, not recruiting	Edgewise Therapeutics, Inc.	United States	Number of adverse events during treatment with sevasemten or placebo 48 months	2027-01-01
NCT05524883	Zeleciment Rostudirsen	Phase 1/2 / Active, not recruiting	Dyne Therapeutics, Inc.	Canada, South Korea, Belgium, United States, Ireland, United Kingdom, Italy, Australia, Spain	Number of Participants With Treatment-Emergent Adverse Events (TEAEs) Through study completion, up to Week 337	2031-09-01
NCT05514249	CRD-TMH-001	Phase 1 / Active, not recruiting	Cure Rare Disease, Inc.	United States	To assess the safety of CRD-TMH-001 1 year	2023-09-01

The table aligns endpoints, sponsors, phases, geographies and readout proxies. It is descriptive, not a head-to-head efficacy comparison. Differences in population, baseline risk, intervention schedule and follow-up can dominate apparent cross-trial differences.

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Protocol design and endpoint interpretation

NCT04687020 is a Phase 4, active, not recruiting study with 9 planned participants. Allocation is N/A, masking is None (Open Label), and the intervention model is Single Group Assignment.

The primary endpoint is “Number of participants with treatment related Adverse Events as assessed by CTCAE v4.0” over “baseline to up to 120 months of treatment.” No additional primary-endpoint description was returned in the selected field set.

Interpretation should test whether the endpoint captures a clinically meaningful change, whether its time horizon matches the proposed biology, and whether treatment discontinuation or missing data can bias the estimate. The planned enrollment of 9 should be assessed against expected effect size, event frequency, multiplicity, subgroup plans and attrition.

No named control drug was returned in the protocol field set. A placebo comparator can strengthen internal efficacy assessment, while an active comparator may better test clinical differentiation. Single-arm and open-label programs require greater weight on objective outcomes, independent assessment and external benchmarks.

Indexed readouts in the surrounding landscape

5 recent result records were selected as contextual evidence for Muscular Dystrophy, Duchenne. These records do not establish direct evidence for NCT04687020 unless the registration number matches.

Vamorolone for Duchenne Muscular Dystrophy

Phase 2; n=133; TTSTAND velocity(12-month): Difference (LS Mean) = 0.004(95.0% CI, -0.025 to 0.032); Difference (LS Mean) = 0.001(95.0% CI, -0.027 to 0.028); TTSTAND velocity(12-month): Difference (LS Mean) = 0.004(95.0% CI, -0.025 to 0.032); Difference (LS Mean) = 0.001(95.0% CI, -0.027 to 0.028) Source: https://pubmed.ncbi.nlm.nih.gov/42202243/

Lowering pre-existing immunity to adeno-associated virus-based gene therapy: Pre treatment with imlifidase or plasmapheresis prior to administration of delandistrogene moxeparvove…

Phase 1; n=8; Micro-dystrophin Expression(Week 12) = 21.5 % ( 0.96 - 42.03); Micro-dystrophin Expression(Week 12) = 1.72 % ( 1.46 - 2.11) Source: https://download.asgct.org/2026ASGCTAbstractPublication.pdf

Family experience data with delandistrogene moxeparvovec gene therapy treatment for Duchenne muscular dystrophy.

Not Applicable; n=31; Improvement in at least one of the most impactful symptoms = 96.0 % Source: https://download.asgct.org/2026ASGCTAbstractPublication.pdf

Result fields should be reconciled with the source record before quantitative comparison. Population definitions, analysis sets, dose cohorts, estimands, confidence intervals, rescue therapy and follow-up can materially change the meaning of a numerical endpoint. Clinical Trials MCP supports repeatable refreshes as result records change.

Asset and sponsor context

Viltolarsen is indexed as ASO with DMD exon 53 biology and a global stage of Approved. The asset profile lists Nippon Shinyaku Co., Ltd. as an originator or developer.

NS Pharma, Inc. is indexed in United States with the website https://www.nspharma.com. Operates as biopharmaceutical company that develops pharmaceuticals for neurological and inflammatory disease The record lists 6 development-stage drug assets.

For execution diligence, monitor sponsor ownership, collaborator additions, site expansion, protocol amendments and enrollment revisions. A change in ownership or geography can alter operational confidence as well as the commercial meaning of a future readout.

Development white space

Endpoint white space. Determine whether a more patient-relevant outcome, longer durability window or blinded central assessment would resolve uncertainty left by the current endpoint.
Population white space. Test biomarker-defined, treatment-line or risk-stratified subgroups where effect size and unmet need could be clearer.
Comparator white space. Identify whether the study can support differentiation against the current standard of care rather than only activity against baseline or placebo.
Geographic white space. Assess whether the disclosed footprint supports recruitment, regulatory transferability and commercial generalizability.
Sequencing white space. Clarify whether Viltolarsen is intended for monotherapy, combination, maintenance, rescue or an earlier treatment line.

White space should be framed as an unanswered development question, not merely an unoccupied mechanism label. A credible program closes a measurable clinical uncertainty with a design that can be executed and interpreted.

Strategic implications and next readouts

For sponsors, the endpoint hierarchy, safety window, enrollment pace and protocol amendment history should all support the same target product profile. Advancement criteria should be set before the readout and tied to clinical effect, uncertainty, tolerability and operational feasibility.

For business-development teams, differentiation may come from a sharper population, stronger comparator, more durable benefit, simpler delivery or clearer sequencing role. For investors, the central risk is evidence quality relative to time and capital, not the phase label in isolation.

Track recruitment status, enrollment changes, primary-completion timing, endpoint revisions, new result records, sponsor ownership and collaborator changes. Re-run the PatSnap MCP workflow when a surrogate becomes a clinical outcome, a single-country study expands, the comparator changes or a new result materially shifts the competitive benchmark.

Source trail and bottom line

Anchor trial: NCT04687020
Protocol source: https://clinicaltrials.gov/study/NCT04687020
MCP sources: Clinical Trials MCP (clinical_trial_fetch and clinical_trial_result_fetch); Drug & Asset MCP (drug_fetch); Company & Deal Intelligence MCP (organization_fetch).
Data snapshot: 28 September 2026.

Viltolarsen in Muscular Dystrophy, Duchenne is best understood through the interaction of protocol design, surrounding readouts, asset context and sponsor execution. The current record makes Number of participants with treatment related Adverse Events as assessed by CTCAE v4.0 and 2032-09-01 the leading decision points.

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