08:51 AM EST, 12/12/2024 (MT Newswires) -- Health care stocks were mixed pre-bell Thursday with the Health Care Select Sector SPDR Fund (XLV) up 0.04% and the iShares Biotechnology ETF (IBB) down 0.01% recently.

Keros Therapeutics ( KROS ) shares slumped by over 73% after the company said it voluntarily halted dosing in the 3 mg/kg and 4.5 mg/kg treatment arms of its phase 2 TROPOS trial of cibotercept in combination with background therapy in patients with pulmonary arterial hypertension.