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Jun 28, 2008    Views: 644
Raising HDL vs. High HDL – The danger of correlation vs. causation.  

I’ve been here at the Gordon Conference on Lipoprotein Metabolism for 3 days now and, I am seeing an amazing trend.  Even if you know nothing about lipids or lipoproteins, you have heard of ‘good’ and ‘bad’ cholesterol.  ‘Good cholesterol’ is found in small lipoprotein particles called high-density lipoproteins or HDL. ‘Bad’ cholesterol is found in low-density lipoproteins or LDL.  It is enormously clear that humans with LDL cholesterol above 100 mg/dl are at significant risk for cardiovascular disease as seen in the Dallas Heart Study, ARIC study, and others.  It is also clear that individuals with high levels of HDL cholesterol are somewhat protected from cardiovascular disease.  So of course the entire pharmaceutical world is hunting for drugs that lower LDL or raise HDL.  Thus statins which are now one the largest drugs ever prescribed, which function to lower blood levels of LDL by upregulating the LDL Receptor in the liver.  If you have a pulse and are over the age of 30 consider being on a statin if you are at high-risk for for cardiovascular disease!

Now comes the interesting other half of the equation.  Recently clinical trials ended for the HDL raising drug torcetrapib. They ended because raising peoples HDL artificially actually killed them faster.  Costing Phizer billions I’m sure.  So I’ve been asking around all the experts here at the meeting and the prevailing under current is, THERE IS NOT ONE SCRAP OF EVIDENCE THAT RAISING HDL CHOLESTEROL IS PROTECTIVE FOR CARDIOVASCULAR DISEASE!  Scandalous.  How many labs whole existence is owed to these particles?  How many pharma jobs will be lost?  Crazy!

So the lesson of this blog is correlation is not causation.  Don’t trust dogma!

Rusty
 

 

Comments of this blog:  1 Comments    Add Your Comment

kumar said:
The point you raise is very interesting. Low HDL level is a risk factor cardiovascular disease and high level of HDL seems to offer some protection against it. But raising HDL level using tocetrapib leads to an increase in adverse cardiovascular events! Two things might be happening here: Tocetrapib may have off-target toxic effects unrelated to HDL raising or artificially raising HDL may lead to adverse effects (may be due to the defective biological function of raised HDL). I think only more experiments with other HDL raising agents can lead to some clarity regarding the effectiveness of raising HDL in protecting against cardiovascular disease. If raising the HDL level (with proper biological function) does not protect against cardiovascular disease then we will know that high HDL is only correlated but not causal to the protection against cardiovascular disease. A third independent factor may be "causing" both events.
Posted on Jun 30, 2008 02:32 AM

Aug 22, 2008 11:10 AM
Aug 20, 2008 02:32 PM
Jul 30, 2008 10:02 AM
Raising HDL vs. High HDL – The danger of correlation vs. cau ...
Jun 28, 2008 06:57 AM
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