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Age-Based Screening for HCV Could Lead to Fewer Cases of Advanced Liver Disease and Related Deaths

May 9, 2011
Article

New research indicates that screening people born between 1946 and 1970 for hepatitis C virus (HCV) instead of current risk-based screening practices is cost effective and could lead to 106,000 fewer cases of advanced liver disease and 59,000 fewer HCV-related deaths. An estimated 1.6 million U.S. residents ages 40 to 64 are infected with HCV but do not know it.

The study, "The Impact of Birth-Cohort Screening for Hepatitis C Virus (HCV) Compared with Current Risk-Based Screening on Lifetime Incidence of and Mortality from Advanced Liver Disease (AdvLD) in the United States," was conducted by Ingenix Life Sciences, Baylor University, Inova Health System and the Harvard School of Public Health and was presented Sunday at Digestive Disease Week (DDW) in Chicago.

The U.S. Preventive Services Task Force currently does not recommend HCV screening of the general population and instead recommends primary-care screening for HCV risk factors, such as intravenous drug use, and testing those at high risk. However, approximately three-quarters of the U.S. HCV-infected population are unaware of their condition, according to the Institute of Medicine. Researchers explored the clinical and cost implications of age-based screening because current risk-based screening practices have had limited success, given the number of undiagnosed cases in the U.S.

"Current risk-based hepatitis C virus screening practices are often limited to people who have symptoms of liver disease or who are considered high risk," said Lisa McGarry, MPH, lead author of the study and director of health economics and outcomes research in Ingenix Life Sciences. "A shortcoming in risk-based screening is that symptoms of the hepatitis C virus might not appear until 20 years or more after an individual has been infected, which is one of the reasons there is a high percentage of undiagnosed cases of HCV. With particularly high hepatitis C infection rates among Baby Boomers, it was important to explore the implications of a targeted, age-based screening approach."

Researchers used an epidemiologically-based mathematical computer model to project economic and clinical outcomes of an age-based screening program. The model first sought to determine how many people in the United States are currently infected and undiagnosed, and how far the disease is likely to have progressed in this population. Then, researchers examined the implications of implementing a screening program targeted at the "Baby Boomer Plus" birth cohort (people born between 1946 and 1970) vs. the current practice of risk-based screening. Finally, they ran the model forward to the remainder of peoples lifetime to see how screening would affect progression to advanced liver disease and mortality.

The model suggests the following:

- Among approximately 102 million people ages 40-64 in the United States, about 1.6 million are infected with HCV but do not know it. Age-based (or "birth-cohort") screening could lead to 106,000 fewer cases of advanced liver disease and 59,000 fewer HCV-related deaths

- Age-based screening would lead to higher overall costs than risk-based screening ($45.1 billion vs. $32 billion), but would yield lower costs related to advanced liver disease ($21.7 billion vs. $25.8 billion)

- Age-based screening would also extend lives at a relatively low cost of $25,279 per quality adjusted life-year2 gained a cost comparable to similar diseases.

"This study is the first to look at birth-cohort screening outcomes for hepatitis C virus and provides compelling evidence for putting age-based screening guidelines into practice," says Zobair M. Younossi, MD, MPH, vice president for research at Inova Health System and executive director of the Center for Liver Diseases at Inova Fairfax Hospital, Falls Church, Va. "The cost of just over $25,000 per quality-adjusted life-year gained through earlier detection and treatment is below U.S. willingness-to-pay thresholds and compares favorably with the economics of screening for many other serious diseases. These findings are especially encouraging given the potential impact of the new treatments for hepatitis C virus that are on the horizon, which werent considered in the study."

Support for the study was provided by Vertex Pharmaceuticals.

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