Knowledge not communicated almost invariably is knowledge wasted, and if the information can help better protect and promote
the health of our public, the waste is intolerable." So writes FDA Commissioner Andrew von Eschenbach in the first issue of
FDA's new Drug Safety Newsletter, which was published last month. The newsletter is one of the steps the agency is taking to respond to the criticisms made
last year in the Institute of Medicine's report on drug safety. It's a nice enough newsletter, something the FDA ought to publish, and I'm certain that some people will find it useful. But does it make the public safer?
Does it fulfill its stated goal of helping physicians to make better decisions? That's another question entirely.
If you haven't seen it yet, the newsletter is a 10-page PDF file (it's also available in HTML format) to be found at fda.gov/cder/dsn/. It contains brief reviews of safety issues related to four drugs—three postmarket and one new molecular entity—plus links
to FDA communications issued between January 1 and June 1.
The review articles mostly look at adverse-event cases reported to FDA. For example, one article provides details on six patients
who have experienced severe rashes while taking Cephalon's Provigil (modafinil) for sleep disorders. We learn age, sex, symptoms,
how long after taking modafinil the symptoms showed up, and (in a couple of cases) what else the patient was taking.
Another piece looks at two cases of progressive multifocal leukoencephalopathy (PML), a viral infection of the central nervous
system, that occurred four to six months after the patients finished a course of rituximab for non-Hodgkins lymphoma. The
article includes a detailed description of the course of the disease, autopsy results, and a list of other conditions that
might have been related to the development of PML.
It's interesting material and certainly useful to somebody. But for a doctor and patient trying to make a decision about taking
or not taking a drug? I don't think so. For practical decision making, you need a different sort of information: How likely
is it that the adverse event was actually caused by the drug? How common is the side effect in absolute terms and compared
with other treatments or no treatment at all? What are the alternatives to the treatment in question, and what are their comparative
risks? What other factors increase or decrease the risk of the adverse event, and how much impact do they have?
And, of course, the newsletter provides none of that. FDA admits as much in its fact sheet on the newsletter. Adverse-event
data just don't work that way. That means the newsletter is going to have next to no impact on how doctors and patients make
decisions. How could it?
FDA, with the best of intentions, has fallen into the same trap Congress and the media have fallen into so many times. Isolated
facts alone don't help you make decisions. For that, you need facts put into context and correctly analyzed. In short, you
need knowledge. And as much as we want knowledge about these drugs and their effects, the fact is that we don't currently have it. No knowledge
means no improved decision making, no matter how thoroughly we publicize the individual data points.
Andy von Eschenbach had it right: Knowledge not communicated is wasted. But it also works the other way around: Communication
without knowledge to communicate is usually wasted too.