Use of DALYs in economic analyses on interventions for infectious diseases: a systematic review.

A systematic literature review was performed on full economic evaluations of infectious disease interventions using disability-adjusted life years (DALY) as outcome measure. The search was limited to the period between 1994 and September 2011 and conducted in Medline, SciSearch and EMBASE databases. We included 154 studies, mostly targeting HIV/AIDS and malaria with most conducted for African countries (40%) and <10% in high-income countries. Third-payer perspective was applied in 29% of the studies, 25% used the societal perspective and 12% used both. Only 16% of the studies took indirect effects (i.e. herd immunity) of interventions into account. Intervention, direct healthcare and indirect non-healthcare costs were taken into account in respectively 100%, 81% and 36% of the studies. The majority of the studies followed the Global Burden of Disease method for DALY estimations, but most studies deviated from WHO cost-effectiveness guidelines. Better adherence to freely accessible guidelines will improve generalizability between full economic evaluations.

Cost-effectiveness of primary HPV screening for cervical cancer in Germany--a decision analysis.

OBJECTIVES: To systematically evaluate the long-term effectiveness and cost-effectiveness of HPV-based primary cervical cancer screening in the German health care context using a decision-analysis approach. METHODS: A Markov-model for HPV-infection and cervical cancer was developed for the German health care context, and applied to evaluate various screening strategies that differ by screening interval and test algorithms, including HPV-testing alone or in combination with cytology. German clinical, epidemiological, and economic data, and test accuracy data from international meta-analyses were used. Outcomes predicted included the reduction in cervical cancer cases and deaths, life expectancy and discounted incremental cost-effectiveness ratios (ICER). The analysis was performed from the perspective of the healthcare system adopting a 3% annual discount rate for costs and outcomes. Extensive sensitivity analyses were performed. RESULTS: HPV-based screening is more effective than cytology alone. It results in a 71-97% reduction in cervical cancer cases as compared to 53-93% for cytology alone. The ICER range from 2600 Euro/LYG (cytology, 5-year-interval) to 155,500 Euro/LYG (annual HPV-testing starting at age 30 years, cytology age 20-29 years). Annual cytology alone, the current recommended screening strategy in Germany, is dominated by HPV-strategies. Increasing the age at screening initiation from 20 to 25 years does not result in a relevant loss in effectiveness but results in lower costs. CONCLUSIONS: Based on our analyses, HPV-based cervical cancer screening is more effective than cytology alone and could be cost-effective if performed at intervals of two years or longer. In the German context, an optimal screening strategy may be biennial HPV screening starting at age 30 years preceded by biennial cytology for women aged 25-29 years. Longer screening intervals may be considered in low-risk women with good screening adherence and in populations with low HPV-incidence.

Benefit, risks and cost-effectiveness of screening for abdominal aortic aneurysm.

PURPOSE: Abdominal aortic aneurysms (AAA) cause a considerable number of deaths. A ruptured AAA is associated with a mortality rate of 80%. The purpose of this study was to summarize the current evidence from published health economic models for the long-term effectiveness and cost-effectiveness of screening programs for AAA. MATERIALS AND METHODS: Medical, economic and health technology assessment (HTA) databases were systematically searched for cost-effectiveness models up to October 2007. Only models with a lifetime time horizon of evaluating AAA screening in men over 65 years were included in the review. Study data were extracted, standardized and summarized in evidence tables and cost-effectiveness plots. RESULTS: We reviewed 8 cost-effectiveness models published between 1993 and 2007 comparing AAA screening and lack of screening in men over 60. One model yielded a loss of life-years at additional costs. The remaining seven models yielded gains in life expectancy ranging from 0.02 to 0.28LYs. Gains in quality-adjusted life expectancy reported by six of the seven models ranged from 0.015 to 0.059 QALYs. Incremental costs ranged from 96 to 721 Euros. Incremental cost-effectiveness ratios (ICER) ranged from 1443 to 13 299 Euros per LY or QALY gained. CONCLUSION: Based on our analysis, the introduction of a screening program to identify AAA will probably gain additional life years and quality of life at acceptable extra costs. The target population for a screening program should be men 65 years and older.

Long-term effectiveness and cost-effectiveness of antiviral treatment in hepatitis C.

We systematically reviewed the evidence for long-term effectiveness and cost-effectiveness of antiviral treatment in patients with chronic hepatitis C. We performed a systematic literature search on the long-term effectiveness and cost-effectiveness of AVT in hepatitis C (1990-March 2007), and included health technology assessment (HTA) reports, systematic reviews, long-term clinical trials, economic studies conducted alongside clinical trials and decision-analytic modelling studies. All costs were converted to 2005euro. Antiviral therapy with peginterferon plus ribavirin in treatment-naïve patients with chronic hepatitis C was the most effective (3.6-4.7 life years gained [LYG]) treatment and was reasonably cost-effective (cost-saving to 84 700euro/quality adjusted life years [QALY]) when compared to interferon plus ribavirin. Some results also suggest cost-effectiveness (below 8400euro/(QALY) of re-treatment in nonresponders/relapsers. Results for patients with persistently normal alanine aminotransferase (ALT) levels or with special co-morbidities (e.g. HIV) or risk profiles were rare. We conclude that antiviral therapy may prolong life, improve long-term health-related quality-of-life and be reasonably cost-effective in treatment-naïve patients with chronic hepatitis C as well as in former relapsers/nonresponders. Further research is needed in patients with specific co-morbidities or risk profiles.