HGF and pulmonary emphysema: In emphysema patients, HGF mRNA correlated positively with total lung capacity (TLC) (Rho = 0.51, p = 0.04, n = 17) and negatively with forced expiratory volume in one second (FEV1) (Rho = -0.53, p = 0.03, n = 17) and FEV1/FVC (forced vital capacity) (Rho = -0.54, p = 0.03, n = 17).