MUC5B and idiopathic pulmonary fibrosis: Likewise, lack of association between this genetic variant and ILD in the context of sarcoidosis30 and systemic sclerosis30,31 was described while differences in MUC5B rs35705950 frequencies were found when patients with sarcoidosis-ILD30 and those with systemic sclerosis-ILD30,31 were compared to patients with IPF.