“The measure of who we are is what we do with what we have” – Vince Lombardi
The measuring of Parkinson’s is complicated. There is such enormous variability between individual cases that the task of assessing people is very difficult.
The primary method that is used in clinics around the world is the Unified Parkinson’s Disease Rating Scale (or UPDRS). It is by no means perfect, and recently (in the wake of several unsuccessful clinical trials) there has been heated debate as to whether it is really up to the task.
Does it accurately reflect the condition? Does it really capture the lived experience? Can it pick up subtle changes associated with potentially disease modifying therapies in clinical trials? Or is it simply a “we’ve always done it this way” kind of tool?
In today’s post, we will look at what the UPDRS is, discuss some of the criticisms associated with it, and consider what solutions to those issues could look like.
This is Andy Grove and his story is rather remarkable.
Born in 1936 to a Jewish family in Budapest, he managed to survive the Nazis, and then fleed Hungary when Soviet tanks started rolling in. Arriving in the US with absolutely nothing, he taught himself English, before going to City College of New York and later the University of California (Berkeley) where he received a PhD in chemical engineering.
And that was just the start of his amazing tale.
After completing his PhD (and publishing a textbook on semiconductors), Grove joined the seminal Silicon Valley company – Fairchild Semiconductor – in 1963. He worked his way up from researcher to assistant director of development, before becoming the first person that Robert Noyce and Gordon Moore (of Moore’s Law fame) hired after they departed Fairchild to start their own little company in 1968.
The name of that company was Intel.
Grove also worked his way up the ladder at Intel – from director of engineering to CEO – and he is credited with transforming the company from a struggling memory chip maker into the processor powerhouse it is today. He was Time’s ‘Man of the Year’ in 1997 and he was a widely revered figure in Silicon valley.
But the path to success was not easy.
Having survived prostate cancer in 1995, Grove was diagnosed with Parkinson’s in 2000. Viewing the situation as a problem solving exercise, he poured tens of millions of his own money into researching Parkinson’s.
Andy & Michael J Fox. Source: MJFF
But coming from the world of ‘Moore’s Law’, Grove became frustrated by a.) the slow speed of progress in the world of biomedical research and b.) the tools used to assess it.
In particular, he disliked the UPDRS, which he referred to as a “piece of crap” (Source – you should read the linked article).
What is the UPDRS?
The biotech company Acorda Therapeutics Inc. yesterday announced that it was halting new recruitment for the phase III program of its drug Tozadenant (an oral adenosine A2a receptor antagonist).
In addition, participants currently enrolled in the trial will now have their blood monitoring conducted on a weekly basis.
The initial report looks really bad (tragically five people have died), but does this tragic news mean that the drug should be disregarded?
In todays post, we will look at what adenosine A2a receptor antagonists are, how they may help with Parkinson’s, and discuss what has happened with this particular trial.
Dr Ron Cohen, CEO of Acorda. Source: EndpointNews
Founded in 1995, Acorda Therapeutics Ltd is a biotechnology company that is focused on developing therapies that restore function and improve the lives of people with neurological disorders, particularly Parkinson’s disease.
Earlier this year, they had positive results in their phase III clinical trial of Inbrija (formerly known as CVT-301 – Click here to read a previous post about this). They have subsequently filed a New Drug Application with the US Food and Drug Administration (FDA) to make this inhalable form of L-dopa available in the clinic, but the application has been delayed due to manufacturing concerns from the FDA (Click here to read more about this). These issues should be solvable – the company and the FDA are working together on these matters – and the product will hopefully be available in the new year.
So what was the news yesterday?
Acorda Therapeutics has another experimental product going through the clinical trial process for Parkinson’s disease.
It’s called Tozadenant.
Tozadenant is an oral adenosine A2a receptor antagonist (and yes, we’ll discuss what all that means in a moment).
Yesterday Acorda Therapeutics Inc announced that they have halted new recruitment for their phase III clinical program. In addition the company is increasing the frequency of blood cell count monitoring (from monthly to weekly) for participants already enrolled in the company’s Phase 3 program of Tozadenant for Parkinson’s disease.
The Company took this action due to reports of cases of agranulocytosis.
The title of today’s post is written in jest – my job as a researcher scientist is to find a cure for Parkinson’s disease…which will ultimately make my job redundant! But all joking aside, today was a REALLY good day for the Parkinson’s community.
Last night (3rd August) at 23:30, a research report outlining the results of the Exenatide Phase II clinical trial for Parkinson’s disease was published on the Lancet website.
And the results of the study are good:while the motor symptoms of Parkinson’s disease subject taking the placebo drug proceeded to get worse over the study, the Exenatide treated individuals did not.
The study represents an important step forward for Parkinson’s disease research. In today’s post we will discuss what Exenatide is, what the results of the trial actually say, and where things go from here.
Last night, the results of the Phase II clinical trial of Exenatide in Parkinson’s disease were published on the Lancet website. In the study, 62 people with Parkinson’s disease (average time since diagnosis was approximately 6 years) were randomly assigned to one of two groups, Exenatide or placebo (32 and 30 people, respectively). The participants were given their treatment once per week for 48 weeks (in addition to their usual medication) and then followed for another 12-weeks without Exenatide (or placebo) in what is called a ‘washout period’. Neither the participants nor the researchers knew who was receiving which treatment.
At the trial was completed (60 weeks post baseline), the off-medication motor scores (as measured by MDS-UPDRS) had improved by 1·0 points in the Exenatide group and worsened by 2·1 points in the placebo group, providing a statistically significant result (p=0·0318). As you can see in the graph below, placebo group increased their UPDRS motor score over time (indicating a worsening of motor symptoms), while Exenatide group (the blue bar) demonstrated improvements (or a lowering of motor score).
Reduction in motor scores in Exenatide group. Source: Lancet
This is a tremendous result for Prof Thomas Foltynie and his team at University College London Institute of Neurology, and for the Michael J Fox Foundation for Parkinson’s Research who funded the trial. Not only do the results lay down the foundations for a novel range of future treatments for Parkinson’s disease, but they also validate the repurposing of clinically available drug for this condition.
In this post we will review what we know thus far. And to do that, let’s start at the very beginning with the obvious question:
So what is Exenatide?