TABLE 1

Numbers of clinical trials published on rare pulmonary diseases from 1990 to April 2017

	1990–1999	2000–2009	2010–April 2017
Lymphangioleiomyomatosis	2	2	17
Idiopathic pulmonary fibrosis	33	60	116
Pulmonary hypertension	464	685	660
Sarcoidosis	96	80	71
Non-cystic fibrosis bronchiectasis	1	10	20