A new precision medicine test could help doctors and patients zero in on the right arthritis drug much sooner. But insurance coverage and drug company incentives are hurdles to widespread use. Adam Gault/SPL/Getty Images hide caption
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AbbVie's Humira was the world's best-selling drug for many years. Now it faces competition for copycats that cost a fraction of its price. David J. Phillip/AP hide caption
Humira, the injectable biologic treatment for rheumatoid arthritis, now faces its first competition from one of several copycat "biosimilar" drugs expected to come to market this year. Some patients spend $70,000 a year on Humira. JB Reed/Bloomberg via Getty Images hide caption