The University of Tokyo · Medicine
Professor Ataru Igarashi's research lab specializes in health economics and outcomes research, with a focus on evaluating the cost-effectiveness and real-world impact of innovative medical treatments across chronic diseases such as hypertension, type 2 diabetes, and hepatitis C. The lab conducts health technology assessments (HTA) using advanced modeling techniques—such as Markov models and Monte Carlo simulations—to inform health policy and guide clinical decision-making. A key emphasis is placed on patient-centered outcomes, including quality of life, willingness-to-pay thresholds, and the economic burden of conditions like dementia in Japan’s aging population.
Figures are computed from collected data and may differ slightly.
Hypertension increases the risk of cardiovascular and other diseases. Lifestyle modification is a significant component of nonpharmacological treatments for hypertension. We previously reported the clinical efficacy of digital therapeutics (DTx) in the HERB-DH1 trial. However, there is still a lack of cost-effectiveness assessments evaluating the impact of prescription DTx. This study aimed to analyze the cost-effectiveness of using prescription DTx in treating hypertension. We developed a month
Japanese patients with T2D appear to prefer oral GLP-1 RA profiles over injectable GLP-1 RA profiles, and administration appears to be the most important factor in this decision. This highlights the unmet need for an effective and orally administered GLP-1 RA for the treatment of T2D in Japan.
<b>Background</b>: Dementia has become a growing health-care problem in the rapidly ageing Japanese population. This study assesses the impact of dementia on quality of life, economic burden, and productivity loss. <b>Objective</b>: The objective of this study was to assess the impact of dementia on the Quality of Life (QoL), economic burden, and productivity loss among families living with dementia. <b>Methods</b>: An online survey was conducted among families who lived with relatives with deme
<b>Objectives:</b> Theoretically, willingness-to-pay (WTP) for quality-adjusted life years (QALY) can vary depending on social and personal preferences and on ex-ante and ex-post settings. However, empirical investigations into the theoretical differences are lacking. In Japan, setting the threshold has been controversial since a pilot project to implement health technology assessments (HTA) launched in 2016. The study aim is to estimate WTP values for one additional QALY from different perspect
Increased utilisation of smoking cessation pharmacotherapy to support quit attempts is predicted to lead to an increase in the number of smokers achieving abstinence, and provide improvements in health outcomes over a lifetime with no additional costs.
SOF combined with RBV was shown to be cost-effective in GT2 patients in Japan. Compared to PEGIFN + RBV, TVR + PEGIFN + RBV and no treatment SOF offers a more efficacious, shorter and better tolerated treatment option and extends treatment to reach HCV-infected patients who are ineligible for interferon-based regimens. Although adverse events were not included in the analyses, this would not make any changes to our conclusion.
AD severity has an impact on QoL, ADL, and caregiving costs.
<b>Background:</b> The objective of this study was to conduct a cost-effectiveness analysis of PCV13 vs. PPV23 and no vaccination and PPV23 vs. no vaccination in adults aged ≥ 60 years with underlying medical conditions which put them at an elevated risk of pneumococcal disease in a Japanese healthcare setting.<b>Research design and methods:</b> A natural history model was developed with a life-long time horizon and 1-year cycle length, with microsimulation as a modeling technique. The expected
Pulmonary arterial hypertension (PAH) is a disease that imposes a significant burden on patients. Although multiple treatment options for PAH are available, head-to-head comparisons are difficult to conduct. Network meta-analysis (NMA) can be a useful alternative for direct comparison to estimate the relative effectiveness of multiple treatments. The objective of the present study was to conduct a systematic review and NMA to evaluate the relative effectiveness among oral PAH medications.Data co
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