Pfizer Inc.'s oral JAK inhibitor Xeljanz (tofacitinib) is an anchor franchise the company hopes to use to build out a broader immunology portfolio, but renewed safety concerns could thwart the brand's future growth prospects. Increased risks of cardiovascular disease and cancers associated with the drug could also cast a cloud over newer JAK inhibitors like AbbVie Inc.'s Rinvoq (upadactanib) and Eli Lilly and Company's Olumiant (baricitinib).
Pfizer's Xeljanz Post-Marketing Study Raises Safety Alarms
A safety study of Pfizer's anchor immunology brand Xeljanz showed higher rates of heart attacks and cancer versus a TNF inhibitor.

More from Immunological
The biotech is banking on itolizumab’s longer-term efficacy as well as unmet need in frontline acute graft-versus-host disease as it prepares to meet with the FDA.
Kyoto-based venture moves HQ to California to expand R&D and business outreach for its regulatory T-cell technology, as it raises around $46m in public and private funding.
Obefazimod has been heralded as a potential blockbuster for ulcerative colitis and there will be great interest in the readout of Phase III induction trials in the third quarter of this year.
The development could highlight the power of competitive market forces over government price controls or suggest Medicare price negotiation is enhancing competitive market forces.
More from Therapy Areas
The UK giant is forecasting peak sales of $5bn plus
Novo’s semaglutide has shown its benefits as an injectable in patients with peripheral arterial disease and as an oral agent in cardiovascular outcomes, but stronger results are expected soon from Lilly’s tirzepatide.
The small interference RNA therapeutic can be used by patients regardless of inhibitor status.