BRISBANE, AUSTRALIA – that show pitavastatin therapy is associated with a significantly lower risk of cardiovascular events than placebo.
“There was a significant 35% lower risk of major adverse cardiovascular events after a median follow-up of 5.1 years “ said Steven Grinspoon, MD, from Massachusetts General Hospital and Harvard Medical School in Boston, who presented the final analysis of data from the REPRIEVE trial at the International AIDS Society Conference on HIV Science.
The results were simultaneously published in the New England Journal of Medicine. The primary endpoint of major adverse cardiovascular events included a composite of outcomes that included cardiovascular death, stroke, myocardial infarction, hospitalization for unstable angina, and transient ischemic attack among those treated with pitavastatin, compared with placebo (95% confidence interval, 0.48-0.90; P = .002).
The REPRIEVE trial was halted earlier this year for efficacy after an interim analysis pointed to a significantly lower rate of cardiovascular events in the treatment group.
The international double-blind, placebo-controlled trial randomly assigned 7,769 people with HIV infection, who were at low to moderate risk of cardiovascular disease, to either 4 mg daily of pitavastatin calcium or placebo.
The secondary outcome – a composite of major cardiovascular events and all-cause mortality – also showed a significant 21% reduction in risk with pitavastatin treatment, compared with placebo (95% CI, 0.65-0.96).
Cardiovascular events in HIV
HIV infection is an independent risk factor for cardiovascular disease, Dr. Grinspoon pointed out, and those living with HIV have about double the risk of myocardial infarction and stroke, compared with the general population.
“There’s an unmet need for people living with HIV who have low to moderate traditional risk, for whom HIV is even considered a risk equivalent but for whom no primary prevention strategy has been tested in a large trial,” Dr. Grinspoon said during an interview.
Those enrolled in the study had a 10-year Atherosclerotic Cardiovascular Disease risk score ranging from 2.1% to 7%, with a median of 4.5%. While LDL cholesterol levels at baseline ranged from 87 to 128 mg/dL, the study showed a similar reduction in cardiovascular risk regardless of LDL.
“These are types of people who, if they came to the doctor’s office right now before REPRIEVE, they would largely be told your risk score is not really making you eligible for a statin,” Dr. Grinspoon said.
He explained that what is most interesting about the reduction in risk is that it was nearly twice what would be expected with LDL lowering, based on what has previously been seen in statin trials in non–HIV-positive populations.
“I think the data are suggesting that it’s certainly in part due to the reduction in LDL – that is very important – but it’s also due to other factors beyond changes in LDL,” Dr. Grinspoon said. He speculated that the statin could be affecting anti-inflammatory and immune pathways, and that this could account for some of the reduction in cardiovascular risk, but “those data are cooking, and they’re being analyzed as we speak.”
In a substudy analysis of REPRIEVE, Markella Zanni, MD, associate professor of medicine at Harvard Medical School and Massachusetts General Hospital, focused on the women in the clinical trial.