Table 3.

Compilation of the cell-specific immunohistochemical results and demographic associations

Factor	Airway cell phenotype	Demographic association
MUC1	Basal cell	↑ Smokers and Chronic bronchitis Correlated negatively with lung functions in male Smokers Correlated positively with pack-years
MUC4	Goblet cells	↑ Smokers
EGFR1	Basal cells	No change
EGFR2	Basal and ciliated cells	↑ Healthy Correlated positively with lung functions Correlated negatively with pack-years and current cigarette consumption

Alterations in abundance are expressed in comparison to the healthy Never-smoker group