U.S. government officials are putting an early end to a study testing an Eli Lilly antibody drug for people hospitalized with COVID-19 because it doesn’t seem to be helping them. Independent monitors had paused enrollment in the study two weeks ago because of a possible safety issue. But on Monday, the National Institute of Allergy and Infectious Diseases, which sponsors the study, said a closer look did not verify a safety problem but found a low chance that the drug would prove helpful for hospitalized patients. It is a setback for one of the most promising treatment approaches for COVID-19.