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A systematic review of the effectiveness of adalimumab

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TABLE 79 Wong et al., 2002 161<br />

© Queen’s Printer and Controller <strong>of</strong> HMSO 2006. All rights reserved.<br />

Health Technology Assessment 2006; Vol. 10: No. 42<br />

Authors Wong, Singh, Kavanaugh<br />

Date 2002<br />

Type <strong>of</strong> economic evaluation Cost–utility analysis<br />

Country <strong>of</strong> origin USA<br />

Currency used US dollars<br />

Year to which costs apply 1998<br />

Perspective Societal<br />

Study population Patients with active, refractory RA<br />

Intervention 1 Placebo + MTX<br />

Intervention 2 Infliximab + MTX<br />

Source <strong>of</strong> <strong>effectiveness</strong> data Data were extrapolated from ATTRACT and ARAMIS. Quality <strong>of</strong> life data were assessed as<br />

self-reported global health using a VAS: for <strong>the</strong> first year data from ATTRACT were used and<br />

after <strong>the</strong> first year estimates were based on ARAMIS<br />

Cost data handled Yes. Drug costs were based on <strong>the</strong> average wholesale price <strong>of</strong> infliximab, infusion<br />

appropriately administration costs and pretreatment evaluation. Direct costs were taken from ATTRACT<br />

and included all non-protocol-related medical care costs. For a societal perspective, indirect<br />

cost estimates from ATTRACT were also used for <strong>the</strong> first year for <strong>the</strong> subset <strong>of</strong> patients<br />

who were employed at <strong>the</strong> time <strong>of</strong> enrolment. Indirect costs beyond <strong>the</strong> first year were<br />

estimated to be between one and three times <strong>the</strong> costs in year 1. Costs from ARAMIS<br />

included self-reported hospitalisation, emergency room visits, outpatient surgeries, home<br />

care and non-traditional treatments, as well as those for physicians, <strong>the</strong>rapists and nurse<br />

practitioners, laboratory tests, radiological studies, drugs and nursing home, rehabilitation or<br />

hospitalisation<br />

Modelling summary Markov model consisting <strong>of</strong> 21 health states to project <strong>the</strong> 54-week results <strong>of</strong> RCTs to<br />

lifetime economic and clinical outcomes. A cycle length <strong>of</strong> 6 months was used<br />

Outcome measures used in Life expectancy and QALYs (based on VAS) to calculate cost per QALY<br />

economic evaluations<br />

Direction <strong>of</strong> result with NE quadrant. $30,500 per QALY<br />

appropriate quadrant location<br />

Statistical analysis for Not undertaken<br />

patient-level stochastic data<br />

Appropriateness <strong>of</strong> statistical NA<br />

analysis<br />

Uncertainty around Not undertaken<br />

cost-<strong>effectiveness</strong> expressed<br />

Appropriateness <strong>of</strong> method NA<br />

dealing with uncertainty<br />

around cost <strong>effectiveness</strong><br />

Sensitivity analysis Yes. Sensitivity analyses were conducted to examine <strong>the</strong> impact <strong>of</strong> varying <strong>the</strong> values used,<br />

with and without indirect costs related to productivity losses from disability<br />

Modelling inputs and Yes<br />

techniques appropriate<br />

Authors’ conclusions Infliximab plus MTX for 54 weeks for RA should be cost-effective, with its clinical benefit<br />

providing good value for <strong>the</strong> drug cost, especially when including productivity losses.<br />

Although infliximab beyond 54 weeks will be likely to be cost-effective, <strong>the</strong> economics and<br />

clinical benefit remain uncertain and will depend on long-term results <strong>of</strong> clinical trials<br />

163

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