The purpose of this study is to learn more about asthma in people who are not well-controlled
with current asthma medication (refractory asthma). The investigators will compare data from
refractory asthmatic patients here at National Jewish Health to mild asthmatics subjects and
to people without asthma. Study experiments involve looking at samples from all 3 groups and
comparing them at a molecular level. These laboratory experiments may help identify subtypes
of refractory asthmatics that require different treatments.