1/16/08

NY Times Fumbles in Editorial on Cholesterol Drug

The Zetia-Vytorin study shows that even when a drug lowers cholesterol dramatically, plaque can increase in a person's arteries. That means that the core claim of all the cholesterol drug makers is called into question by the study. The rupture of plaque is what causes most heart attacks. The closure of arteries by plaque is what causes progressive coronary artery disease.

Dr. Jarvik can say what he wants about Lipitor. Vytorin can put on all the cute cartoon-like ads that it desires. If lowering cholesterol does not lower plaque, the game is over. Meanwhile the Times has bombed in its editorial, not going to that factual conclusion, as follows.
Editorial
Cholesterol Drug Bombs

There have long been suspicions, but it was still very disturbing to learn this week that a heavily promoted cholesterol-lowering drug had flunked a clinical trial of its effectiveness in reducing fatty deposits in arteries. The two companies that reap billions from the drug had been cynically sitting on the results for more than a year.

The drug, Zetia, and a combination pill that contains it, Vytorin, are made by Merck and Schering-Plough and used by millions of patients. They generated more than $5 billion in sales last year. The companies sponsored a clinical trial of the drug’s effectiveness in hopes that positive results would strengthen their marketing efforts.

The trial was conducted in 720 European patients with genes that cause abnormally high cholesterol levels. For two years, the patients received either Zocor, an older cholesterol drug, or Vytorin, a combination of Zocor and Zetia. The assumption was that Vytorin would reduce the growth of fatty plaques — a risk factor for heart attacks and strokes — more than Zocor alone. As it turned out, the plaques grew almost twice as fast in patients taking the Vytorin.

There are reasons to be cautious about interpreting these results. The number of patients was relatively small. And many of them may have used different drug treatments for years before entering the trial, possibly diminishing the effectiveness of adding Zetia.

The companies’ grudging release of the data has raised disturbing questions. A House committee will explore whether they withheld the results lest they interfere with sales and only released them under pressure from Congress and news media reports. Whatever the committee discovers, the experience is one more argument for why scientists involved in studies sponsored by drug companies must insist on the right to review and release data. A new law that strengthens the penalties for companies that do not release data promptly should help.

The findings also raise doubts about the current belief that lowering cholesterol is the key to cardiovascular health. The study showed that Vytorin reduced bad cholesterol significantly more than Zocor alone. The problem was that it failed to reduce the formation of plaque.

The companies are conducting three large clinical trials to test whether Vytorin can nevertheless reduce heart attacks and strokes. Results won’t be available until at least 2011. Meanwhile, with no evidence of effectiveness in plaque-reduction, it seems clear that Zetia and Vytorin should be used sparingly, in cases where all other cholesterol drugs have failed.

6 comments:

Shmendrik said...

What's the obvious conclusion? Statins do indeed prevent cardiovascular events and reduce mortality, if that's what you're trying to get at.

Tzvee said...

Says who? Not this study. And that is the obvious point.

Shmendrik said...

You've entirely missed the point of the study. Vytorin is not simply a statin, it's a combination of a statin with another cholesterol lowering drug, Zetia. The study showed that adding Zetia to a statin had a negative effect. Statin therapy by itself has been established as effective in large randomized trials.

http://en.wikipedia.org/wiki/Heart_protection_study
http://en.wikipedia.org/wiki/Scandinavian_Simvastatin_Survival_Study
http://en.wikipedia.org/wiki/ASTEROID_trial

Tzvee said...

No I think you miss the point. The credibility and trustworthiness of every study has been called into question by the actions of these two major drug companies. PS: Wikipedia? Really?!

Shmendrik said...

I see you're a stubborn ass about everything, not just your Modern Orthodox YCT partisanship. Your first point doesn't even merit a response, as the other studies were not conducted by drug companies. Yes, Wikipedia. It describes the studies succinctly and has links to the actual articles.

Tzvee said...

I don't even mention YCT on this blog. But yes this is a blog and I express opinions and I defend them when need be. The studies are tainted by drug company money and investigator greed. And that should be more obvious to you now. Who then is the stubborn shmendrik?