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CHICAGO – has been provided by the Japanese EWTOPIA 75 trial.
Ezetimibe (Zetia) at 10 mg/day reduced the risk of the primary endpoint, a composite of atherosclerotic cardiovascular events, by 34% compared with a dietary counseling control group over the course of 5 years of followup. Yasuyoshi Ouchi, MD, PhD, reported the findings of the 3,796-patient study at the American Heart Association scientific sessions.
There was also a 40% relative risk reduction for cardiac events in the ezetimibe group. The 22% reduction in cerebrovascular events, however, didn’t achieve statistical significance, and there was no between-group difference in all-cause mortality, said Dr. Ouchi, principal investigator in EWTOPIA 75 and professor emeritus of geriatric medicine at the University of Tokyo.
The landmark randomized clinical trials of lipid-lowering for primary cardiovascular prevention included too few elderly participants to permit assessment of its merits and possible harms in that population. This has left a major evidence gap at a time when in many parts of the world, including the United States, Europe, and Japan, the population over age 75 is growing explosively.
“Along with this population change, the number of patients age 75 and older with hypercholesterolemia has dramatically increased,” Dr. Ouchi continued.
Eligibility for EWTOPIA was restricted to patients who were at least 75 years old, had an LDL of at least 140 mg/dL, no history of CAD, and had at least one high-risk factor, such as diabetes or hypertension. Their mean age at enrollment was 80.7 years. Seventy-four percent of them were women, reflecting the significantly longer life expectancy of Japanese women compared to men.
The study design was open-label with no placebo arm. Dr. Ouchi argued that this was appropriate, given that the components of the primary composite endpoint were “entirely objective”: fatal and nonfatal MI, fatal and nonfatal stroke, sudden cardiac death, and coronary revascularization.
The mean LDL in the ezetimibe group dropped from 162 mg/dL at baseline to 120 mg/dL at 5 years, versus 131 mg/dL in the control group.
Ezetimibe was the lipid-lowering agent selected for EWTOPIA because it has an excellent safety record in older patients. There were no important differences between the two study arms in terms of adverse events, according to Dr. Ouchi.
Discussant Jennifer G. Robinson, MD, said that for a decade she has tried without success to get backing for a primary prevention statin trial in elderly U.S. patients, so congratulations to the Japanese investigators are in order.
She expressed doubts as to the generalizability of the EWTOPIA results to non-Japanese populations, however.
“Frankly, I was very surprised to see the large effect size. EWTOPIA had far more effect than we expected based on other trials of LDL-lowering agents to date,” said Dr. Robinson, professor of epidemiology and medicine and director of the Prevention Intervention Center at the University of Iowa, Iowa City.
“It’s a little better performance than we expected from that magnitude of LDL lowering, which was quite modest,” she added.
Among the possible explanations she cited for the greater magnitude of reduction in major vascular events seen in EWTOPIA as compared, for example, to the IMPROVE-IT trial, which also utilized ezetimibe, are genetic differences in the Japanese population. It’s known that the Japanese have different genetic polymorphisms of Niemann-Pick C1 Like 1 (NPC1L1), which is what ezetimibe binds to in order to inhibit small intestinal enterocyte uptake and absorption of cholesterol. Or it might just be that older adults, regardless of their ethnicity, have a more robust response to LDL lowering than the younger ones who’ve been the focus of previous trials.
“I think the LDL lowering from ezetimibe was very effective in Japanese older adults without cardiovascular disease, and I think that’s a very appropriate therapy for primary prevention moving forward in that population,” Dr. Robinson said.
As for herself, she’s awaiting confirmation in other populations. She’s particularly eager to see the outcome of the ongoing double-blind, randomized STAREE trial of atorvastatin (Lipitor) at 40 mg/day or placebo for primary prevention in 18,000 Australians age 70 and up. Results are expected in 2022.
Dr. Ouchi reported having no financial conflicts regarding the EWTOPIA study, funded by the Japanese government.
SOURCE: Ouchi Y. AHA Late Breaker 02.
CHICAGO – has been provided by the Japanese EWTOPIA 75 trial.
Ezetimibe (Zetia) at 10 mg/day reduced the risk of the primary endpoint, a composite of atherosclerotic cardiovascular events, by 34% compared with a dietary counseling control group over the course of 5 years of followup. Yasuyoshi Ouchi, MD, PhD, reported the findings of the 3,796-patient study at the American Heart Association scientific sessions.
There was also a 40% relative risk reduction for cardiac events in the ezetimibe group. The 22% reduction in cerebrovascular events, however, didn’t achieve statistical significance, and there was no between-group difference in all-cause mortality, said Dr. Ouchi, principal investigator in EWTOPIA 75 and professor emeritus of geriatric medicine at the University of Tokyo.
The landmark randomized clinical trials of lipid-lowering for primary cardiovascular prevention included too few elderly participants to permit assessment of its merits and possible harms in that population. This has left a major evidence gap at a time when in many parts of the world, including the United States, Europe, and Japan, the population over age 75 is growing explosively.
“Along with this population change, the number of patients age 75 and older with hypercholesterolemia has dramatically increased,” Dr. Ouchi continued.
Eligibility for EWTOPIA was restricted to patients who were at least 75 years old, had an LDL of at least 140 mg/dL, no history of CAD, and had at least one high-risk factor, such as diabetes or hypertension. Their mean age at enrollment was 80.7 years. Seventy-four percent of them were women, reflecting the significantly longer life expectancy of Japanese women compared to men.
The study design was open-label with no placebo arm. Dr. Ouchi argued that this was appropriate, given that the components of the primary composite endpoint were “entirely objective”: fatal and nonfatal MI, fatal and nonfatal stroke, sudden cardiac death, and coronary revascularization.
The mean LDL in the ezetimibe group dropped from 162 mg/dL at baseline to 120 mg/dL at 5 years, versus 131 mg/dL in the control group.
Ezetimibe was the lipid-lowering agent selected for EWTOPIA because it has an excellent safety record in older patients. There were no important differences between the two study arms in terms of adverse events, according to Dr. Ouchi.
Discussant Jennifer G. Robinson, MD, said that for a decade she has tried without success to get backing for a primary prevention statin trial in elderly U.S. patients, so congratulations to the Japanese investigators are in order.
She expressed doubts as to the generalizability of the EWTOPIA results to non-Japanese populations, however.
“Frankly, I was very surprised to see the large effect size. EWTOPIA had far more effect than we expected based on other trials of LDL-lowering agents to date,” said Dr. Robinson, professor of epidemiology and medicine and director of the Prevention Intervention Center at the University of Iowa, Iowa City.
“It’s a little better performance than we expected from that magnitude of LDL lowering, which was quite modest,” she added.
Among the possible explanations she cited for the greater magnitude of reduction in major vascular events seen in EWTOPIA as compared, for example, to the IMPROVE-IT trial, which also utilized ezetimibe, are genetic differences in the Japanese population. It’s known that the Japanese have different genetic polymorphisms of Niemann-Pick C1 Like 1 (NPC1L1), which is what ezetimibe binds to in order to inhibit small intestinal enterocyte uptake and absorption of cholesterol. Or it might just be that older adults, regardless of their ethnicity, have a more robust response to LDL lowering than the younger ones who’ve been the focus of previous trials.
“I think the LDL lowering from ezetimibe was very effective in Japanese older adults without cardiovascular disease, and I think that’s a very appropriate therapy for primary prevention moving forward in that population,” Dr. Robinson said.
As for herself, she’s awaiting confirmation in other populations. She’s particularly eager to see the outcome of the ongoing double-blind, randomized STAREE trial of atorvastatin (Lipitor) at 40 mg/day or placebo for primary prevention in 18,000 Australians age 70 and up. Results are expected in 2022.
Dr. Ouchi reported having no financial conflicts regarding the EWTOPIA study, funded by the Japanese government.
SOURCE: Ouchi Y. AHA Late Breaker 02.
CHICAGO – has been provided by the Japanese EWTOPIA 75 trial.
Ezetimibe (Zetia) at 10 mg/day reduced the risk of the primary endpoint, a composite of atherosclerotic cardiovascular events, by 34% compared with a dietary counseling control group over the course of 5 years of followup. Yasuyoshi Ouchi, MD, PhD, reported the findings of the 3,796-patient study at the American Heart Association scientific sessions.
There was also a 40% relative risk reduction for cardiac events in the ezetimibe group. The 22% reduction in cerebrovascular events, however, didn’t achieve statistical significance, and there was no between-group difference in all-cause mortality, said Dr. Ouchi, principal investigator in EWTOPIA 75 and professor emeritus of geriatric medicine at the University of Tokyo.
The landmark randomized clinical trials of lipid-lowering for primary cardiovascular prevention included too few elderly participants to permit assessment of its merits and possible harms in that population. This has left a major evidence gap at a time when in many parts of the world, including the United States, Europe, and Japan, the population over age 75 is growing explosively.
“Along with this population change, the number of patients age 75 and older with hypercholesterolemia has dramatically increased,” Dr. Ouchi continued.
Eligibility for EWTOPIA was restricted to patients who were at least 75 years old, had an LDL of at least 140 mg/dL, no history of CAD, and had at least one high-risk factor, such as diabetes or hypertension. Their mean age at enrollment was 80.7 years. Seventy-four percent of them were women, reflecting the significantly longer life expectancy of Japanese women compared to men.
The study design was open-label with no placebo arm. Dr. Ouchi argued that this was appropriate, given that the components of the primary composite endpoint were “entirely objective”: fatal and nonfatal MI, fatal and nonfatal stroke, sudden cardiac death, and coronary revascularization.
The mean LDL in the ezetimibe group dropped from 162 mg/dL at baseline to 120 mg/dL at 5 years, versus 131 mg/dL in the control group.
Ezetimibe was the lipid-lowering agent selected for EWTOPIA because it has an excellent safety record in older patients. There were no important differences between the two study arms in terms of adverse events, according to Dr. Ouchi.
Discussant Jennifer G. Robinson, MD, said that for a decade she has tried without success to get backing for a primary prevention statin trial in elderly U.S. patients, so congratulations to the Japanese investigators are in order.
She expressed doubts as to the generalizability of the EWTOPIA results to non-Japanese populations, however.
“Frankly, I was very surprised to see the large effect size. EWTOPIA had far more effect than we expected based on other trials of LDL-lowering agents to date,” said Dr. Robinson, professor of epidemiology and medicine and director of the Prevention Intervention Center at the University of Iowa, Iowa City.
“It’s a little better performance than we expected from that magnitude of LDL lowering, which was quite modest,” she added.
Among the possible explanations she cited for the greater magnitude of reduction in major vascular events seen in EWTOPIA as compared, for example, to the IMPROVE-IT trial, which also utilized ezetimibe, are genetic differences in the Japanese population. It’s known that the Japanese have different genetic polymorphisms of Niemann-Pick C1 Like 1 (NPC1L1), which is what ezetimibe binds to in order to inhibit small intestinal enterocyte uptake and absorption of cholesterol. Or it might just be that older adults, regardless of their ethnicity, have a more robust response to LDL lowering than the younger ones who’ve been the focus of previous trials.
“I think the LDL lowering from ezetimibe was very effective in Japanese older adults without cardiovascular disease, and I think that’s a very appropriate therapy for primary prevention moving forward in that population,” Dr. Robinson said.
As for herself, she’s awaiting confirmation in other populations. She’s particularly eager to see the outcome of the ongoing double-blind, randomized STAREE trial of atorvastatin (Lipitor) at 40 mg/day or placebo for primary prevention in 18,000 Australians age 70 and up. Results are expected in 2022.
Dr. Ouchi reported having no financial conflicts regarding the EWTOPIA study, funded by the Japanese government.
SOURCE: Ouchi Y. AHA Late Breaker 02.
REPORTING FROM THE AHA SCIENTIFIC SESSIONS
Key clinical point: LDL-lowering for primary cardiovascular prevention in elderly patients has been shown for the first time to impart significant net benefit.
Major finding: The incidence of atherosclerotic cardiovascular events was reduced by 34% in elderly patients on ezetimibe at 10 mg/day, compared with usual care.
Study details: The 5-year prospective randomized EWTOPIA 75 trial included 3,796 Japanese patients age 75 and older with elevated LDL and no history of CAD.
Disclosures: The presenter reported having no financial conflicts regarding the study, sponsored by the Japanese government.
Source: Ouchi Y. AHA Late Breaker 02.