A new experimental drug for adults with asthma seems to improve lung function in patients who haven’t been helped with standard steroids. The drug, lebrikizumab, targets a specific receptor involved in asthma, and appears to be the first drug to be successful in this particular approach, said Dr. Steve Georas, a professor of medicine in the pulmonary and critical care division at the University of Rochester Medical Center. It is also perhaps the first drug to have this specific effect in asthmatics, and may lead to more gains in individualized treatments for patients.