title: Abbott cancels arm of protease inhibitor trial.
mesh_terms: D002986:Clinical Trials as Topic; D017320:HIV Protease Inhibitors / Q000627:therapeutic use*; D006801:Humans; D019438:Ritonavir; D013844:Thiazoles / Q000627:therapeutic use*; D014633:Valine / Q000627:therapeutic use*
chemical_list: D017320:HIV Protease Inhibitors; D013844:Thiazoles; D014633:Valine; D019438:Ritonavir