01:51 PM EDT, 04/25/2024 (MT Newswires) -- Health care stocks fell Thursday afternoon, with the NYSE Health Care Index decreasing 0.6% and the Health Care Select Sector SPDR Fund (XLV) down 0.4%.

The iShares Biotechnology ETF (IBB) dropped 1.4%.

In corporate news, Bristol-Myers Squibb ( BMY ) shares plunged 8.6% after the company posted a Q1 loss.

GSK (GSK) filed a lawsuit against Pfizer ( PFE ) and BioNTech (BNTX) in a Delaware federal court, alleging patent infringement related to the messenger RNA, or mRNA, technology used in the Pfizer-BioNTech Comirnaty COVID-19 vaccines. GSK shares rose 0.2%, Pfizer ( PFE ) fell 2.8% and BioNTech dropped 1.3%.

AstraZeneca ( AZN ) shares jumped 5.7% after the company reported higher Q1 core earnings and revenue.