Here's what the NIH said:
"The National Heart, Lung, and Blood Institute (NHLBI) of the National Institutes of Health has stopped a clinical trial studying a blood lipid treatment 18 months earlier than planned. The trial found that adding high dose, extended-release niacin to statin treatment in people with heart and vascular disease, did not reduce the risk of cardiovascular events, including heart attacks and stroke.
Participants were selected for AIM-HIGH because they were at risk for cardiovascular events despite well-controlled low-density lipoprotein (LDL or bad cholesterol). Their increased risk was due to a history of cardiovascular disease and a combination of low high-density lipoprotein (HDL or good cholesterol) and high triglycerides, another form of fat in the blood. Low HDL and elevated triglycerides are associated with an increased risk of cardiovascular events. While lowering LDL decreases the risk of cardiovascular events, it has not been shown that raising HDL similarly reduces the risk of cardiovascular events.
During the study’s 32 months of follow-up, participants who took high dose, extended-release niacin and statin treatment had increased HDL cholesterol and lowered triglyceride levels compared to participants who took a statin alone. However, the combination treatment did not reduce fatal or non-fatal heart attacks, strokes, hospitalizations for acute coronary syndrome, or revascularization procedures to improve blood flow in the arteries of the heart and brain...
...The Data Safety Monitoring Board also noted a small and unexplained increase in ischemic stroke rates in the high dose, extended-release niacin group. This contributed to the NHLBI acting director's decision to stop the trial before its planned conclusion. During the 32-month follow-up period, there were 28 strokes (1.6 percent) reported during the trial among participants taking high dose, extended-release niacin versus 12 strokes (0.7 percent) reported in the control group. Nine of the 28 strokes in the niacin group occurred in participants who had discontinued the drug at least two months and up to four years before their stroke. Previous studies do not suggest that stroke is a potential complication of niacin, and it remains unclear whether this trend in AIM-HIGH arose by chance, was related to niacin administration or some other issue. "
Here's what the Prince of Posturing said two years ago...
According to Dr Nissen, ezetimibe "badly failed" the few surrogate outcome studies completed to date. The ENHANCE trial, he recalled, showed a 50 mg/dL greater reduction in LDL-C with simvastatin 80 mg plus ezetimibe 10 mg vs simvastatin 80 mg alone, but no difference in CIMT change. There was even a slight trend toward CIMT progression in the simvastatin plus ezetimibe group. The suggestion that because patients were pretreated with statins, there was too little plaque to observe a differential effect was "nonsense," he said, pointing out that in a similar population in the ASAP trial, a difference of 36 mg/dL in LDL-C lowering was associated with a mean CIMT regression of 0.31 mm.
Dr Brown agreed that ENHANCE was carried out in the wrong population. He noted that many of the patients had been in previous trials for years and had only stopped lipid-lowering therapy for 6 weeks prior to the active phase of ENHANCE, suggesting that they should have had no CIMT to lower. Looking at the same data from ASAP as Dr Nissen, however, he pointed out that all the effect on CIMT was seen in the first year of treatment, which was consistent with the observation that nothing happened in the ENHANCE patients.
According to Dr Nissen, ARBITER 6-HALTS was "equally disturbing, showing a "troubling" decrease in HDL-C and no real change in CIMT with ezetimibe. Again, Dr Brown doubted that the trial was carried out in an appropriate population, since the patients in this trial were at their LDL-C and non-HDL goals at baseline and he would not have chosen ezetimibe for this particular population. He also noted that because the trial was stopped early, some patients (40 on ezetimibe and 35 on niacin) who were still in the study were not analyzed because they had not reached the pre-specified 14-month observation point.
Both presenters noted that there are 2 large trials, SHARP and IMPROVE-IT, underway to examine the effectiveness of ezetimibe in CAD prevention, but neither Dr Nissen nor Dr Brown believes that these are the best trials to answer outstanding questions about ezetimibe. Dr Nissen said he believes that IMPROVE-IT will fail. Dr Brown maintains that a different trial is needed, which he believes would be successful, based on evidence with ezetimibe to date.
Also...
Dr Steven Nissen (Cleveland Clinic, OH), also commenting on the results for heartwire, called ARBITER 6-HALTS a classic "comparative-effectiveness" study and said there have been calls in the US legislature for such trials for the past few years.
"Now, here it is," he said. "Niacin is a 50-year-old drug, and you can buy it over the counter at your local pharmacy. When you have an inexpensive therapy like this—there are issues about being able to tolerate high-dose niacin, but if you get patients to tolerate it—niacin looks to be a better strategy."
www.theheart.org/article/1022265.do
Notably, Nissen touts he results of the first small study as a great example of comparative effectiveness research. Ironically, he's right. Small studies using surrogate measures (most notably the use of ultra-sound to measure thickening of arterial walls, a technique 'invented' and peddled by Nissen) often surprise. But CER community and it's "stakeholders" had all but hailed the ARBITER study as conclusive.
Not that Nissen hasn't engaged in fearmongering based on small studies, meta-analysis, etc only to be rebuked by science. His meta-analysis of CV risk associated with Avandia was undermined by an FDA analysis and the ACCORD study. (Sadly, he was successful in virtually killing off the drug.)
