SMAD2 and idiopathic pulmonary fibrosis: Furthermore, KCa3.1 expression correlated significantly with both basal αSMA expression, r = 0.79, P = 0.0176, and basal Smad2/3 localisation, r = 0.9245, P = 0.0029 in both NFC and IPF donors (Figure 2C and D).