Inhaled insulin flops, but field may hold promise

By Deena Beasley

LOS ANGELES (Reuters) - Inhaled insulin may be a debacle that pharmaceutical companies want to put behind them as quickly as possible, but many companies are still working to develop drugs that are delivered through the lungs.

Asthma has been treated with inhalants for decades, and inhaled drugs now under development include treatments for other pulmonary diseases, like cystic fibrosis or infections of the lung, as well as a faster-onset version of an existing migraine drug.

"This is a way to deliver high concentrations of medication to the target organ," said Kevin Corkery, senior director of the pulmonary business unit at Nektar Therapeutics, which last week abandoned its Exubera inhalable insulin program after onetime partner Pfizer Inc said clinical trials found increased cases of lung cancer.

Nektar, known before 2003 as Inhale Therapeutic Systems, is developing inhalable dry powder versions of anti-infectives for treating pneumonia in the lung as well as aerosolized forms of antibiotics for patients with cystic fibrosis, a genetic disease in which the body produces a thicker-than-normal mucus that clogs the lungs and other organs.

Pfizer had already decided last year to stop marketing Exubera, which had only marginal sales despite the pitch of being more convenient than traditional insulin injections. The decision cost the company a $2.8 billion pretax charge.

After the world's largest drugmaker acknowledged its product was never going to see the blockbuster sales it once hoped, Eli Lilly and Novo Nordisk this year also ended inhaled insulin development programs.

Tiny MannKind Corp remains a notable holdout, repeating this week that it remains committed to its experimental inhaled insulin, Technosphere, which it believes holds advantages over the other products.

"The safety issues related to inhaled insulin really center on the fact that it is a growth factor going into the lung," said Tim Nelson, chief executive at MAP Pharmaceuticals Inc, which is developing an inhalable migraine drug and an asthma drug for toddlers and preschoolers.