As parents of a son with Duchenne muscular dystrophy, we feel blessed every day we spend with our sons. It’s not every day, however, that we have reason to rejoice about the future. Today is one of those days. AVI Biopharma announced the top line results from their phase 2 trial for Eteplirsen, a drug which induces exon skipping in patients amenable to a skip of exon 51.
Chris Garabedian, CEO of AVI gave the the top line results which showed that after 24 weeks, four patients on the 30 mg. dose had an average increase of dystrophin of 22.5%. The patients that had received the 50 mg. dose for 12 weeks did not show an increase in dystrophin, suggesting that duration of treatment is important.
I will always caution families, we still don’t know if exon skipping will actually become a real treatment for our sons with Duchenne, or to what extent it will help them. On today’s conference call announcing these results, AVI’s chief medical officer, Ed Kaye, referred to “reasonable” dystrophin needed to function as 20%, so this study does indeed give us proof of concept and hope that we might have a treatment sometime in the future.
Dr. Eric Hoffman at Children’s National Medical Center in Washington DC. spearheaded a collaboration with CNMC along with the Foundation to Eradicate Duchenne and CureDuchenne several years ago. This collaboration gave critical funding to AVI at a very crucial time which allowed them to move forward with the preclinical work neccessary to progress into this phase 2 human clinical trial. Dr. Jerry Mendell and Dr. Kevin Flanigan at Nationwide Children’s Hospital in Columbus, OH, have played a pivotal role in conducting this trial over the last several months. We are very grateful to these investigators and organizations for their vision and dedication.
What Comes Next?
There’s a song named “Two Out Of Three Ain’t Bad.” We now have reasonable data that suggests the drug is safe, there were no adverse events seen. And, we know that the drug can produce dystophin, and at a reasonable amount. Now, the big question is whether this quality/quantity of dystrophin will result in meaningful outcome measures and really help Duchenne patients live longer and healthier lives.
All patients including the placebo group that were on the phase 2 are now on the open label extension study at either the 30 mg. or 50 mg. dose. They will stay on this dose until they complete a total of 48 weeks dosing, at which time a biopsy will be taken and clinical outcome measures tested. In the meantime, AVI will be actively involved with the FDA, compiling a brief and planning the pivotal phase 3 study. Simutaneously, more animal studies will be conducted. Since the FDA will most likely not accept the presence of dystrophin alone as justification to move forward with Eteplirsen, this extension phase and the data they gather will be very important. The first patient to be dosed began in August of 2011, which would make this data available later this year.
As we await the clinical outcomes of the extension trial, AVI will be busy looking to the future, and CureDuchenne is equipped and ready to support their subsequent research on additional exons and next generation exon skipping compounds. CureDuchenne will always fund research projects that show more immediate potential to help our Duchenne sons, such as already approved FDA drugs to slow the progression. But, CureDuchenne will never take it’s eye off of the prize…to correct the actual defect that causes this terrible disease. CureDuchenne is committed to fund research, like exon skipping, that will replace the missing dystrophin protein, while we fund more immediate research that could get FDA approved or off target drugs to keep our sons going in order to take advantage of these higer impact drugs.
CureDuchenne was also the first US organization to support Prosensa, another exon skipping biotech company. Prosensa was able to leverage our funds and received a committment of up to $650 million to develop their drugs and is in the process of recruiting patients for their phase 3 pivotal trial.
Two out of three may not be bad, but it’s not enough. So please join me as we rejoice in the possibility of an effective treatment, while at the same time show restraint with our expectations, since so many drugs do fail, even at late stage trials. One thing is for sure…we will need all of you to support these research efforts…
TOGETHER, WE CAN CURE DUCHENNE!
If you would like to learn more about our exon skipping efforts, please call me at 949-872-2552
Debra Miller








Cure Duchenne will host its third annual “Breakfast with the Experts” at the Duchenne Scientific Summit on February 11th at the Balboa Bay Club in Newport Beach, CA. The meeting will be broadcast via a worldwide webcast. You will be able to submit questions online.