Pfizer is ringing the changes as it exits the second quarter, tossing out a midstage pneumococcal vaccine candidate and a handful of phase 1 assets including a respiratory syncytial virus (RSV) prospect it picked up in last year’s ReViral takeover.
The quarterly pipeline update (PDF) features the removal of two phase 2 assets, including the previously disclosed defenestration of its oral obesity and diabetes candidate lotiglipron over safety concerns. The other phase 2 candidate to get the ax in the update is PF-06842433, a vaccine that was in development for the prevention of invasive and noninvasive pneumococcal infections in infants and children.
Pfizer ran (PDF) a phase 1/2 clinical trial of the seven-valent pneumococcal conjugate vaccine from 2018 to 2020. The vaccine candidate was designed to complement the pneumococcal coverage provided by Prevnar 13, but, with Prevnar 20 now approved, Pfizer has moved on from the program.
The update also covers the discontinuation of six phase 1 assets, including PF-07923567. The N-protein inhibitor, also known as RV-299, is one of the RSV candidates that Pfizer added to its pipeline in a deal to buy ReViralReViral for $436 million upfront last year. Work on the most advanced program included in the deal, sisunatovir, continues, but Pfizer has decided it can do without PF-07923567.
Pfizer is also jettisoning a pair of atopic dermatitis programs and another pair of solid tumor assets. In atopic dermatitis, the Big Pharma followed up the discontinuation of one topical “soft” JAK inhibitorJAK inhibitor last year by axing a similar molecule that it was studying in the same phase 1 trial. Alongside that, it has cut PF-07242813, a CD1a inhibitor, after wrapping up a phase 1 trial in healthy volunteers and atopic dermatitis patients.
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