We also found no significant correlation between the percentage of P63+TTF-1+, CC10+TTF-1+ and SPC+TTF-1 + cells in the sub-epithelium and the duration of symptoms, nor was a significant correlation found with FEV1 % predicted, age and the modified Reiff score in bronchiectasis patients (Figure 7). This evidence concerns the gene TTF1 and bronchiectasis.