SPPL2C and idiopathic interstitial pneumonia: Genetic studies in familial and sporadic IPF patients have revealed an association between IPF susceptibility and telomerase-related genes [18], surfactant-associated genes [19, 20], mucin 5B gene, toll interacting protein (TOLLIP), and the signal peptide peptidase like 2C (SPPL2C) [21, 22].