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Using a mouse model, they simulated IPF by administering bleomycin, a chemotherapy agent that causes cell injury and confirmed that the resulting lung scarring resolved itself over the span of about six weeks.

The 16 drugs that Pfizer and Cipla will sell have unfamiliar names like vinblastine, bleomycin and fluorouracil.

The B drug in that combination, bleomycin, can cause lung damage, and even death, in a small number of patients.

Those who didn't have a clear scan -- suggesting a more resistant form of the blood cancer -- continued chemotherapy with bleomycin.

Bleomycin has been used to treat Hodgkin lymphoma for 30 years, researchers said.