It has been almost five years since Pfizer Inc.'s Xeljanz (tofacitinib) was approved by the US FDA for rheumatoid arthritis, and the drug is just finally reaching the blockbuster-level sales investors had been hoping for years ago.
Xeljanz' long road to blockbuster status points to the challenges new drugs face in competitive therapeutic categories like rheumatoid arthritis, even when they offer a valuable benefit to patients. In the case of Xeljanz, the drug was a first-in-class JAK inhibitor and the first new oral option in a category dominated by injectable tumor necrosis factor inhibitors like AbbVie Inc.'s Humira (adalimumab) and Amgen Inc
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