Healthcare stocks declined late Thursday afternoon, with the NYSE Healthcare Index and the State Street Health Care Select Sector SPDR ETF (XLV) each shedding 1.5%.
The iShares Biotechnology ETF (IBB) was up 0.3%.
In corporate news, Xencor (XNCR) shares rose 11% after the company said it has reached a settlement agreement with AstraZeneca (AZN) subsidiary Alexion Pharma International to resolve a commercial dispute over US royalties on Ultomiris. AstraZeneca shares were down 1%.