Abstract
9068 Background: Success of a target therapy is directly correlated with the accuracy of its companion diagnostic test. Without a corresponding biomarker, target therapy may yield shorter survival, waste time, increase burdens and costs. As important as conducting cost-effectiveness studies for therapies, it is also valuable to compare different molecular tests. In lung cancer, the mutational status of EGFR and translocation of ALK and ROS-1 are commonly tested to offer the best intervention. Our objective is to evaluate the cost-effectiveness of a unique exam using NGS versus other routinely used tests such as the ones which involve RT-PCR and FISH. Methods: Target population is NSCLC, adenocarcinoma, and candidates to first-line therapy. Strategy 1: test EGFR mutation if EGFR test is negative, individual follow to FISH for ALK; if FISH is negative, follow to FISH for ROS-1. Strategy 2: differs from 1 since FISH for ALK and ROS are requested together. Strategy 3: all individuals are submitted to NGS (multicomplex platform which include EGFR, ALK, ROS-1 and other genes). Tests could also be classified as unknown due to the quality of tumor sample. Prevalence of biomarker, test accuracy and proportion of unknown results were used to calculate each decision tree branch. Sensitivity and specificity was obtained from literature review using Sanger as reference standard for RT-PCR tests and NGS. The study was analyzed from a healthcare-payer perspective based on Brazilian private sector. Costs were based on data from diagnostic companies, ANS and AMB-CBHPM 2016. Results: The use of NGS added 24% extra cases correct identified as well as extra costs (US$ 800.76; PPP 2015) attributed to the molecular testing. The ICER comparing NGS with sequential tests was US$ 3,381.82/correct case detected. Comparing strategy 2:1, the ICER was US$937.86/correct case detected. Conclusions: this study is part of an effort to integrate companion diagnostics discussions on precision medicine and covered drugs in the Brazilian health system. These findings can also subsidy cost-effectiveness studies that incorporates subsequent treatments and survival.
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