Infinity Pharmaceuticals said its cancer drug failed to improve overall survival in a mid-stage study on patients with non-small cell lung cancer who had a history of smoking.

The drug, retaspimycin HCl, also failed to improve overall survival in patients with squamous cell carcinoma, a type of non-small cell lung cancer that is closely linked to smoking.

The company said it will not start any new trials with the drug, but would complete enrollment in a separate study by the end of the year.

Infinity said it will now focus on developing IPI-145, which it is testing to treat advanced blood cancers, asthma and rheumatoid arthritis.

The company tested retaspimycin HCl in combination with docetaxel, an approved cancer drug, comparing it with a combination of docetaxel and placebo in patients who failed to respond to prior treatment.

Infinity said the safety of the drug plus docetaxel was comparable to docetaxel and placebo.