The Fenofibrate Intervention and Event Lowering in Diabetes (FIELD) study was a 5 year
randomized, placebo-controlled study of 9,795 patients with type 2 diabetes mellitus treated with
fenofibrate.
Fenofibrate demonstrated a non-significant 11% relative reduction in the primary outcome of
coronary heart disease events (hazard ratio [HR] 0.89, 95% CI 0.75 to 1.05, p=0.16) and a
significant 11% reduction in the secondary outcome of total cardiovascular disease events (HR
0.89 [0.80 to 0.99], p=0.04). There was a non-significant 11% (HR 1.11 [0.95, 1.29], p=0.18)
and 19% (HR 1.19 [0.90, 1.57], p=0.22) increase in total and coronary heart disease mortality,
respectively, with fenofibrate as compared to placebo.
In the Coronary Drug Project, a large study of post myocardial infarction of patients treated for
5 years with clofibrate, there was no difference in mortality seen between the clofibrate group
and the placebo group. There was however, a difference in the rate of cholelithiasis and
cholecystitis requiring surgery between the two groups (3.0% vs. 1.8%).
Because of chemical, pharmacological, and clinical similarities between fenofibrate, clofibrate,
and gemfibrozil, the adverse findings in 4 large randomized, placebo-controlled clinical studies
with these other fibrate drugs may also apply to fenofibrate.
In a study conducted by the World Health Organization (WHO), 5,000 subjects without known coronary artery disease were treated with placebo or clofibrate for 5 years and followed for an additional one year. There was a statistically significant, higher age-adjusted all-cause mortality in the clofibrate group compared with the placebo group (5.70% vs. 3.96%, p=< 0.01). Excess mortality was due to a 33% increase in non-cardiovascular causes, including malignancy, post-cholecystectomy complications, and pancreatitis. This appeared to confirm the higher risk of gallbladder disease seen in clofibrate-treated patients studied in the Coronary Drug Project.
The Helsinki Heart Study was a large (n=4,081) study of middle-aged men without a history of
coronary artery disease. Subjects received either placebo or gemfibrozil for 5 years, with a
3.5 year open extension afterward. Total mortality was numerically higher in the gemfibrozil
randomization group but did not achieve statistical significance (p=0.19, 95% confidence
interval for relative risk G:P=0.91-1.64). Although cancer deaths trended higher in the
gemfibrozil group (p=0.11), cancers (excluding basal cell carcinoma) were diagnosed with equal
frequency in both study groups. Due to the limited size of the study, the relative risk of death
from any cause was not shown to be different than that seen in the 9 year follow-up data from
World Health Organization study (RR=1.29). Similarly, the numerical excess of gallbladder
surgeries in the gemfibrozil group did not differ statistically from that observed in the WHO
study.
A secondary prevention component of the Helsinki Heart Study enrolled middle aged men
excluded from the primary prevention study because of known or suspected coronary heart
disease. Subjects received gemfibrozil or placebo for 5 years. Although cardiac deaths trended
higher in the gemfibrozil group, this was not statistically significant (hazard ratio 2.2, 95%
confidence interval: 0.94 to 5.05). The rate of gallbladder surgery was not statistically significant
between study groups, but did trend higher in the gemfibrozil group, (1.9% vs. 0.3%, p=0.07).
There was a statistically significant difference in the number of appendectomies in the
gemfibrozil group (6/311 vs. 0/317, p=0.029).