Clinical Trials and Emerging Research Show Promise for LCA Treatments

Forty clinical trials and a lot of pre-clinical research into LCA treatments show promising pathways to discovering the next LUXTURNA®, according to Shannon Boye, PhD, the opening speaker for the Virtual VISIONS 2020 conference, presented earlier this summer by the Foundation Fighting Blindness

The breakthrough drug developed by Spark Therapeutics marked a milestone in the history of genetic research as the first gene therapy in the United States for any inherited disease and as the first to treat one of the more than 25 forms of Leber congenital amaurosis (LCA).

Shannon Boye, PhD in a lab coat
Shannon Boye, PhD

Boye, along with Foundation Chairman of the Board David Brint and Foundation Chief Executive Officer Benjamin Yerxa  PhD, kicked off the three-day, first-time virtual conference, the Foundation’s major annual gathering. Rather than convening in person, the event’s speakers, exhibitors and more than 1,600 attendees participated through an online app, due to concerns surrounding the coronavirus pandemic.

Brint said that the 40 clinical trials and more emerging treatments for various IRDs span the disease profile.

“No matter what your disease is, these hopefully will be able to restore vision,” Brint said. “In the next 10 years, we have an opportunity to bring many more vision-saving treatments into and through the pipeline and across the finish line.”

Yerxa said the topic of genetic therapies would be good to lead off with because of the sheer variety of innovative programs and approaches to each therapeutic challenge.

“There’s essentially a revolution happening right now in personalized medicine and genetic therapies in general,” Yerxa said.

Boye, an assistant professor in the Department of Ophthalmology at the University of Florida, addressed the audience in the beginning session called: “Mission Possible! What’s Next?”

She discussed three major strategies in treating LCA and other IRDs: Gene supplementation or gene replacement therapyRNA therapeutics and gene editing

Boye set up an analogy to better understand the complexities of these strategies, saying we all have little letters in our bodies called DNA. Subunits of those letters – that DNA – are genes. RNA carry the instructions from DNA for making proteins, the building blocks of life.

“They act alone or in concert with a bunch of other proteins to perform essential functions.”

Continuing her letters analogy, Boye said, imagine a friend texts you: ‘Please take out the dog.’ You get that message and perform that function because letters combined correctly to tell you to take the dog out. 

If only the word ‘Please’ appears on your phone screen, you don’t take the dog out.

Or, if the ‘d’ is pushed and an ‘l’ comes out, sending the message, ‘Please take the log out,’ “you then have a mess to clean up,” she quipped.  

In the first strategy of gene supplementation or gene replacement, the right protein needs to be expressed in the patient’s retina. 

The letters need to be correctly sequenced to generate a coherent message, in this case, telling a protein to perform an important function. Any break in that cascade of events can cause visual impairment. 

The gene replacement therapy LUXTURNA is a human-engineered virus containing copies of the corrective gene that doctors deliver through a subretinal injection so the cells can make the originally missing protein.

“You deliver the right letters that make the right message and the right protein,” she said. “That’s a pretty simple concept. That’s LUXTURNA.”

Developed to improve vision in people with LCA2* caused by a mutation in the RPE65 gene, LUXTURNA received Food and Drug Administration approval for  use in humans in December 2017. 

One area of Boye’s research as Associate Division Chief of Cellular and Molecular Therapeutics is entering into a Phase 1/2 clinical trial, applying the same premise for mutations in the GUCY2D gene that causes LCA1

“It’s early,” she said. “But this is an example of another perhaps next LUXTURNA being right around the corner.”

She cited similar research moving forward on other IRDs, including Retinitis Pigmentosa (RP)Choroideremia, and Bardet Biedl Syndrome (BBS)

The second strategy is a form of RNA therapeutics that uses antisense oligonucleotides (AONs) – short, single-stranded DNA  molecules that interact with messenger RNA to correct translation of a targeted gene. Think of an AON as an autocorrect feature that binds to the ‘l’ in log and changes to a ‘d’ for dog.

Promising pre-clinical work now in Phase 2/3 for CEP290 or LCA10 also is coming out of Rob Collin’s research group in The Netherlands, Boye said.

Another AON program underway addresses a form of Usher Syndrome

The third strategy – the newest and most exciting – is gene editing. A guide RNA is used to drag a special enzyme to a region in the DNA that contains the mutation, and the enzyme cuts the DNA, like molecular scissors. 

Researchers are exploring a host of gene editing variations, including cutting out a specific area of DNA and replacing it with the right letters to make a coherent message. The lab work has created paths to address a range of IRDs, including CEP290,  Usher Syndrome,  RP, Stargardt Disease and Choroidermia.

“There’s an absolute exponential increase in the therapies that are being developed,” she said.

These strategies are not limited to the disease conditions under discussion and can be more widely applied to a number of genes and conditions.

Addressing those who do not have RPE65 or LCA2 for which a treatment exists, Boye said, with all of this research in progress, “that one day, there’s going to be a LUXTURNA for your inherited retinal disease, too.” 

The Role of the Patient Voice in Rare Disease Advocacy

It’s you. It’s all about you.

The journey from identifying a rare disease, to conducting studies, to approving a treatment, is long – but it always starts with the patient, and the information patients share among the medical, biotechnological and advocacy communities, as well as within the patient community.

At a fall gathering of families living with Leber congenital amaurosis (LCA) and other rare inherited retinal diseases (IRDs), Lisa Bernier found help and support for her visually impaired daughter for the first time in seven years. Bernier and her 25-year-old daughter, Aimee, traveled to the first-ever Hope in Focus (formally Sofia Sees Hope) LCA Family Conference at the insistence of Aimee’s optometrist.

“Advocacy ends after school ends,” Bernier says.

Lisa and Aimee Bernier

Aimee has Bardet-Biedl Syndrome (BBS), a complex disorder affecting many parts of the body, including the retina. She and others with BBS have retinal degeneration similar to retinitis pigmentosa (RP). Aimee had good experiences at the Perkins School for the Blind and graduated in 2011. Then it became difficult for her mother to find support.

“We’re basically on our own, to advocate for ourselves,” Bernier says. Her 30-year-old son also has BBS with many, but not all, of the same characteristics, and his vision loss is five years’ advanced.

(Editor’s note: Laws vary from state to state, but typically, public education is required to provide services to students in need until age 21, even after high school graduation. Children with learning disabilities who receive services under the Individuals with Disabilities Education Act (IDEA) or the Rehabilitation Act of 1973 (RA) in public elementary and secondary school may continue to have legal rights under federal laws in college programs and in employment. When students graduate from high school or reach age 21, their rights under the IDEA come to an end. As resources can vary greatly from state to state, finding support and resources for a child may fall on the family post-graduation.)

During the early years, Bernier searched for any information on BBS and RP through reading the New England Journal of Medicine, which described those with BBS as having low cognitive skills and dying from kidney failure. Even when Aimee was born, the doctors didn’t understand BBS. Bernier and her husband were grateful to be introduced to the doctors and genetic staff at Shriners Hospitals for Children in Springfield, Mass., where they helped with the health care needs of Aimee and her brother until they were 18.

Bernier said she was thrilled to be at the conference in a roomful of retinal experts, patient advocates, and families attending the Oct. 6 gathering.

Active Patient Community Is Key

During multiple sessions, attendees heard updates on research, learned about the roles played by organizations developing treatments, and gained insight into how an active patient community can support and accelerate treatment.

Spark Therapeutics,  Applied Genetic Technologies Corporation (AGTC), National Organization for Rare Disorders (NORD),  Foundation Fighting Blindness (FFB), and Sofia Sees Hope are among the many partners working to collaborate with and learn from the patient community to propel research momentum.

More than 50 people from New England, across the country and Mexico attended the conference, including the session titled “The Role of the Patient Voice in Developing Treatments for Rare Disease.” Sofia Sees Hope Executive Director Annette Tonti moderated a three-member panel comprised of:

• Jamie Ring, Head of Patient Advocacy at Spark Therapeutics, which developed the gene therapy called LUXTURNA™ that helps restore vision to people with RPE65 genetic mutations;

Jill Dolgin headshot
Jill Dolgin

• Jill Dolgin, PharmD, Head of Patient Advocacy at AGTC, a clinical stage biotechnology company focusing on rare IRDs and developing therapies that replace “broken” genes with normal, functional genes;

• Kristen Angell, Associate Director of Advocacy at NORD, a voice for the 30 million Americans with rare diseases and the official U.S. sponsor of Rare Disease Day, which takes place annually on the last day of February.

Personal experiences of family and/or friends dealing with rare diseases motivated all three women to become advocates for patients. As Angell paradoxically put it: “Rare disease has always been common in my family.”

Ring, Dolgin and Angell are a critical part of a relatively new profession – patient advocacy – to help people find support and learn how to become engaged in the process of drug development and research to find treatments for rare diseases.

Kristen Angell headshot
Kristen Angell

Ring from Spark Therapeutics said she has a passion for helping amplify the voices of the patients and their families and making sure those voices are understood and considered.

“People feel their story doesn’t matter,” she said. “The thing in rare disease is that YOU ARE the expert,” and patient information is critical to doctors and biotechnology companies alike. “At Spark, we want to make sure that patient voice has a seat at the table.”

“There’s no one-size-fits-all,” Ring said. “Simply connecting with other people is probably the most important thing you can do … and having the clarity of your diagnosis allows you to do that most effectively.”

For IRDs, it is essential to know your gene and it’s a good idea to register with My Retina Tracker, a confidential, online, patient registry managed by the Foundation Fighting Blindness. Patient data tracked through registries and collected by researchers helps scientists and biotechnology companies develop clinical drug trials.

AGTC’s Dolgin told the audience that 7,000 rare diseases exist, but fewer than 15 percent have advocacy groups that can assist patients with resources, advocate for clinical research, and find access to vital therapies.

Dolgin, a trained pharmacist, emphasized: “As patient advocates in the pharmaceutical industry, we’re representing the patient at the corporate table.” A priority for the company is to find and educate people with IRDs and encourage them to get genetically tested.

Patients need to be identified, encouraged to enroll in natural history studies, and followed systematically through natural history studies long before beginning the clinical drug trials necessary to seek approval for commercial use from the U.S. Food and Drug Administration. Natural history studies are critical components to clinical research, providing an understanding of the rate of disease progression without treatment to the rate of disease progression after treatment.

Angell said NORD developed 20 patient registries for 20 different diseases in the last few years. She oversees the Rare Action Network, with 5,000 members nationally and ambassadors in 32 states, including Connecticut. The network empowers patients and families to directly reach out to lawmakers to encourage and support the rare disease community.

Angell also encouraged using social media and suggested setting up programs with local chambers of commerce to make people aware of patients in their own community.

“Awareness goes hand in hand with advocacy.”

The role of the patient voice continues even more so after development of a treatment. Ask the people with families living with LCA. Sofia Sees Hope has been working to connect these families who have similar concerns and many of them have supported one another and become friends.

Tami Morehouse attended the patient advocacy session and served as panelist in a conference session earlier in the day called “The Road to Treatment: Understanding How Therapies Are Developed.” She is a pioneering LCA patient, in that at age 44 in 2009, Morehouse became the oldest person at the time to take part in the successful Phase 1 RPE65 gene therapy trial, a precursor to the FDA’s December 2017 approval of LUXTURNA.

She’s had many conversations with people involved in the process of LCA treatment or are hopeful they might be involved in a future clinical trial. The first person she talked with was Sarah St. Pierre Schroeder, the mother of now 10-year-old Creed Pettit. They communicated last April on the eve of the boy’s surgery in which doctors at Miami’s Bascom Palmer Eye Institute would inject under his retina a human-engineered virus that gives instructions on how to produce an essential protein for vision.

“I kept thinking about her and Creed in the days prior to Creed’s procedure,” Morehouse said. “I remembered how I felt when I was in their shoes and couldn’t help but reach out to them on the night before Creed’s procedure. As it turned out, Sarah seemed very open and happy to talk with someone who had been there and understood a little about all that they were feeling and wondering about.”

Creed’s mom felt enormous relief in talking with Morehouse.

“I will never forget the emotions I felt when Tami reached out to me,” St. Pierre Schroeder said. “Every sentence in her email brought me more comfort about what I was doing for Creed. She was so open about her journey, I felt like we had known each other forever.”

LUXTURNA took decades of research, many millions of dollars and countless advocacy connections to come to fruition. It is a long journey that begins with the patient and comes full circle.