160
Participants
Start Date
December 31, 2011
Primary Completion Date
June 30, 2013
Study Completion Date
December 31, 2013
Pirfenidone
Pirfenidone（200mg）tablets will be taken two tablets 3 times a day during the whole study process.
placebo
placebo will be taken two tablets 3 times a day during the whole study process
Collaborators (1)
Nanjing Chia-tai Tianqing Pharmaceutical
INDUSTRY
Shanghai Pulmonary Hospital, Shanghai, China
OTHER