---
title: "Deramiocel, Duchenne trials, and how small design choices can make or break studies"
id: "stat-news-3-opinion-capricor-s-duchenne-muscular-dystrophy-drug-and-the-countless-tiny"
canonical_url: "https://medichelpline.com/clinical-feed/stat-news-3-opinion-capricor-s-duchenne-muscular-dystrophy-drug-and-the-countless-tiny"
content_type: "clinical_feed_article"
specialty: "Neurology"
source_name: "STAT News"
source_url: "https://www.statnews.com/2026/08/20/capricor-deramiocel-duchenne-muscular-dystrophy-rare-disease-studies-decisions/?utm_campaign=rss"
published_at: "2026-08-20T08:30:00.000Z"
evidence_level: "Verified Feed"
license: "CC-BY-NC-4.0 / Informational Use"
---
# Deramiocel, Duchenne trials, and how small design choices can make or break studies
## Provenance & Clinical Metadata
- **Canonical URL:** https://medichelpline.com/clinical-feed/stat-news-3-opinion-capricor-s-duchenne-muscular-dystrophy-drug-and-the-countless-tiny
- **Specialty:** [Neurology](https://medichelpline.com/clinical-feed/neurology.md)
- **Primary Source:** STAT News
- **Source URL:** [Original Journal Publication](https://www.statnews.com/2026/08/20/capricor-deramiocel-duchenne-muscular-dystrophy-rare-disease-studies-decisions/?utm_campaign=rss)
- **Published At:** 2026-08-20T08:30:00.000Z
- **Evidence Rating:** Verified Feed
## Executive GIST (TL;DR)
- The author, Mindy Leffler, is a developer of the **Duchenne Video Assessment** and consults on its data; her son with **Duchenne muscular dystrophy** has been treated with **deramiocel** for five years. - Capricor’s deramiocel received a negative FDA advisory committee vote on a secondary outcome: the drug’s definitiveness in stabilizing heart function in a mixed population that included boys with stable hearts. - The advisory committee observed noisier data for the overall population compared with clearer significance in the subpopulation that already had signs of cardiac dysfunction. - The essay emphasizes that designing rare-disease trials requires hundreds of small decisions (inclusion criteria, outcome definitions, domain versus total scores) that are hard to predict yet critically affect outcomes and patients’ lives. - Narrow inclusion criteria can improve chances of statistical significance but risk slow enrollment and jeopardize programs. - The primary outcome in the discussed Phase 3 trial assessed **upper limb** performance split into shoulder, arm, and hand tasks; using a total score captures more potential changes but can introduce noise when participants vary widely in which domains are preserved or lost. - Choosing a single domain (for example, arm tasks) might increase statistical power but could miss meaningful effects in the weakest or strongest participants. - The Duchenne field has been running trials for over a decade, but there still isn’t enough accumulated data to resolve many of these design trade-offs with confidence. - The author frames the regulatory challenge as finding the right balance between rigid **pre-specification** and the ability to learn and adapt analyses in rare diseases. - The FDA allowed Capricor to submit additional upper limb data and analyses rather than require a new biologics license application, a flexibility the author views as siding with patients while still aiming to preserve rigor. - The author hopes the agency will use appropriate and rigorous methods when reviewing the resubmitted analyses to understand treatment effects for young men on therapy like her son.
## Clinical Analysis & Structured Key Points
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Test your knowledge with our new weekday mini crossword [ Start solving ](https://www.statnews.com/stat-mini-crossword/) Opinion[First Opinion](https://www.statnews.com/category/first-opinion/) # Capricor’s Duchenne muscular dystrophy drug and the countless tiny decisions that can make or break a study ## Lots of sick people’s lives depend on getting these little decisions right * [Manage alerts for this article](https://www.statnews.com/my-account/edit/#emails) * Email this article * [Share this article](https://www.statnews.com/2026/08/20/capricor-deramiocel-duchenne-muscular-dystrophy-rare-disease-studies-decisions/?utm_campaign=rss) ![](https://www.statnews.com/wp-content/uploads/2026/08/AdobeStock_2103075570-645x645.jpeg) Adobe By Mindy Leffler Aug. 20, 2026 Leffler developed the Duchenne Video Assessment, used in Capricor’s phase 3 study, and consults on its data. Five years ago, we moved my son into a college dorm. I know that makes us sound like thousands of other families with 18-year-olds, but my son has Duchenne muscular dystrophy. He couldn’t walk, and because of his waning arm strength, we all thought his college independence would be short-lived. Instead, we are now getting ready to move him into that same dorm again, where he still lives independently, so he can begin the second year of his master’s degree study. He has spent those five years on Capricor’s deramiocel, a drug that received a [negative FDA advisory committee vote last week](https://www.statnews.com/2026/07/29/capricor-therapeutics-deramiocel-fda-review-meeting-live-blog/) on its secondary outcome: the definitiveness of its ability to stabilize heart function in a population of boys that included ones whose hearts were still stable. It was much noisier data than the significance seen in the subpopulation that already had signs of heart dysfunction. Advertisement The decision demonstrates something important: Designing a rare disease study consists of hundreds of tiny decisions. Sponsors make them with the best knowledge they have at the time but with no way of predicting each decision’s impact with high degree of certainty because they are the ones blazing the trail. But lots of sick people’s lives depend on getting these little decisions right. One general example: Narrowing inclusion criteria gives you a better chance at statistical significance, but it introduces risk on reaching enrollment, which can then jeopardize the whole program. Another specific one from my son’s study: The primary outcome is the performance of upper limb, which is divided into measurements of shoulder, arm, and hand function. You can use the total measure or an individual domain. Advertisement Related Story ![](https://www.statnews.com/wp-content/uploads/2019/04/Duchenne-muscular-dystrophy-768x432.jpg) ### ![](https://www.statnews.com/wp-content/themes/stat/images/home/statplus.svg) [STAT Plus: FDA expert panel recommends against approval of Capricor’s Duchenne drug](https://www.statnews.com/2026/07/29/capricor-therapeutics-deramiocel-fda-review-meeting-live-blog/) The total measure gives you more tasks that could potentially capture meaningful changes in your weaker (hand tasks) or stronger (shoulder tasks) participants. But it can introduce noise because lots of participants have already lost their shoulders, and lots of them are going to keep their hands. You could focus only on the arm tasks to shoot for better statistical significance, but are you then going to risk leaving meaningful change for your weakest and strongest participants on the table? We’re into a second decade of clinical trials in Duchenne; by now, those of us in the Duchenne community are well aware of these challenges. We just don’t have enough data yet to guide the little decisions with certainty as the field continues to evolve. Other rare diseases are in the same boat. That brings us to the pivotal question on regulatory flexibility in rare disease: What is the appropriate balance between the strictest possible definition of pre-specification and the necessary ability to learn as we go? Striking that balance is an art, and it’s a task for the Food and Drug Administration that I don’t envy. There are passionate advocates on both sides of the scale. They have valid and legitimate points about patients’ urgent, unmet need, about the need to uphold pre-specification as the primary tenet of scientific experimentation. Last week, the FDA chose to allow Capricor to submit additional upper limb data and analyses to refocus on the primary outcome. The agency weighed the completion and submission of a new biologic licensing application against the lives and function that would be lost during the time required for completion and chose to side with the patients. My family and I are grateful. It is the kind of regulatory flexibility that can be exercised in rare disease without sacrificing rigor. My hope, as regulators turn their attention to the art of analysis for the upper limb data and navigate the totality of all those little decisions, is that their guiding principle is trying to understand what’s really happening to young men on treatment like my son, and that they use appropriate and rigorous methods for doing so. They are determining his fate. Advertisement _Mindy Leffler developed the Duchenne Video Assessment, used in Capricor’s Phase 3 study, and consults on its data._ * * * ###### Letter to the editor Have an opinion on this essay? [Submit a letter to the editor](https://www.statnews.com/submit-a-letter-to-the-editor/?subject=Capricor%E2%80%99s%20Duchenne%20muscular%20dystrophy%20drug%20and%20the%20countless%20tiny%20decisions%20that%20can%20make%20or%20break%20a%20study). [biotechnology](https://www.statnews.com/topic/biotechnology/), [FDA](https://www.statnews.com/topic/fda/), [rare diseases](https://www.statnews.com/topic/rare-diseases/) [Submit a correction request](https://www.statnews.com/contact/?how_can_we_help_=Editorial%20Correction%20Request)[Reprints](https://www.parsintl.com/publications/stat/) 1. Mindy Leffler ![](https://www.statnews.com/wp-content/themes/stat/images/article-new/envelope-open.svg) ![](https://www.statnews.com/wp-content/uploads/2023/06/First-Opinion-Logo-Black-640x319.png) ### Newsletter The smartest thinkers in life sciences on what's happening — and what's to come Please enter a valid email address. 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